bash remove trailing newline from variable

} ERROR("EXPORTED_WORLD_WRITABLE", if ($sanitise_quote eq '*/' && substr($line, $off, 2) eq '*/') { sub get_stat_real { $herecurr); if ($realfile !~ m@scripts/@ && $herecurr) && foreach my $word (@array) { # bitfield continuation if ($line =~ /^\+. $fix) { next if ($fline =~ /^\-/); if (!$in_header_lines && fix_delete_line($fixlinenr, $rawline); $fix) { :/\*|\*/)[^"]*"@) { if ($line =~ /(^. :$typeTypedefs\b)| print "Must be run from the top-level dir. foreach my $word (sort keys %$hashRef) { :un)?signed\s+)?int last if (!defined $lines[$line]); NOTE: For some of the reported defects, checkpatch may be able to my $soff = $off; return @r; :\s+$Modifier)*\s*=\s*($zero_initializer)\s*;/) { return ($level, $linenr, @chunks); our $mode_perms_string_search = ""; $herecurr); if (!$quiet) { sub statement_lines { # check for old HOTPLUG __dev section markings if ($line =~ /\s\]/) { :^|[^=])=\s*$/) { $in_commit_log = 0; print "DEFINE($1,$2)\n" if ($dbg_values > 1); $camelcase_file_seeded = 1; 0[0-7][0-7][2367] if ($line =~ /^\s*signed-off-by:/i) { $fix && $prevline =~ /^\+/ && $line =~ /^\+/) { load_acquire| ($line =~ /(?:\s|^)[0-9a-f]{12,40}(? WARN("USE_DEVICE_INITCALL", [A-Z_]*ATTR/ || "Block comments should align the * on each line\n" . $op eq '%') } You can preserve newlines, for example by setting IFS to empty: Thanks for contributing an answer to Ask Ubuntu! :0xff|255)$/i) { "$call() should probably be ${call}_t($cast, $arg1, $arg2)\n" . next; "DT compatible string \"$compat\" appears un-documented -- check $dt_path\n" . $type = 'C'; } $is_start = 1; (\S+)$/) { +{ my ($line) = @_; if ($line =~ /\bdev_printk\s*\(\s*KERN_([A-Z]+)/) { if ($realfile =~ /\. if (! } fix_insert_line($fixlinenr, "\+\t" . } elsif ($l =~ /^[\+ ]/) { my $hasdesc = 0; # print("line: \nprevline: \ns: \nc: \n\n\n"); } elsif ($dstat =~ /^\+\s*#\s*define\s+$Ident. "'const $found const *' should probably be 'const $found * const'\n" . # check for sizeof without parenthesis $rawline =~ /^Content-Type:.+charset="(.+)". next if ($realfile !~ /\. is a terminal ('auto'). $hereptr)) { } "$cnt_chk checks, " : "") . $check = 0; if ($line =~ /^\+\t{6,}/) { sub ctx_has_comment { If you specifically need to remove only newline characters, pass the '\n' character as an argument to string.rstrip('\n'). $_ = "--color=$color"; return ($level, @res); } } "consider using a completion\n" . $hereprev) && } warn "CHECK ($line)\n" if ($dbg_possible > 2); if (ERROR("SPACING", } hash_show_words(\%use_type, "Used"); if ($type eq '#' && $c eq "\n" && $p ne "\\") { $hereptr)) { my $p; if (ERROR("SPACING", # Check for old stable address "Prefer $newfunc over $oldfunc with multiply\n" . if ($line =~ /^new (file )?mode. } # function brace can't be on same line, except for #defines of do while, if (ERROR("SPACING", next if (!$hunk_line || $line =~ /^-/); push(@modifierListFile, $modifier); If you were to do it in pure bash, you would probably need to ANSI-quote your pattern to represent newline. } elsif ($cur =~ /^(\()/o) { $newstore = "${var}_store" if ($store ne "NULL" && $store ne "${var}_store"); } if ($delay > 2000) { $remain--; $realcnt=1+1; exit(0); if ($extension eq "x" && !defined($stat_real)) { } elsif ($rawline =~ /^\+/) { qr{(?:(? $octal_perms eq "0444" || my $newfunc = "kmalloc_array"; WARN("VOLATILE", + memcpy(old->unit, newalias->unit, sizeof(old->unit)); :un)?signed\s+int}, my $ok = 0; our $Lval = qr{$Ident(? } ##print "LINE: $rawlines[$end_line - 1 ]\n"; $hereprev); my $stmt_lines = $#stmt_lines + 2; my $r1 = $a1; my $last_blank_line = 0; 'fix-inplace!' # Track the previous line. } :[\w\.\-]+\/)++[\w\.\-]+:/ || if ($file =~ m{^(.*?)(? $herecurr); # 2. at the beginning of a line for slice initialisers -- [010] = 5, } my $coff_set = 0; } $herecurr) && $funcname . $blk .= $rawlines[$line]; )}; } elsif ($op eq '<>' or raw_line($count, 0); last; WARN("BOOL_BITFIELD", or warn "No structs that should be const will be found - file '$conststructsfile': $!\n"; } $allowed = 1; if ($stat_next =~ /^\s*while\b/) { if ($clean == 1) { $line =~ /\bstruct\s+($const_structs)\b(? #print "APW \n"; if (!defined $root) { } if (!defined $suppress_ifbraces{$linenr - 1} && # URL ($rawline is used in case the URL is in a comment) qr{fastcall}, } defined $lines[$ctx_ln - 1]) $do_fix = 0; if (!$in_commit_log && } @typeListFile = (); )\bmemcmp\s*$\s*$FuncArg\s*,\s*$FuncArg\s*\,\s*ETH_ALEN\s*$/) { $linenr >= 3 && Using default one. $realline_next++; :;|=|\[|$) (? $herecurr) && }; } *\bNR_CPUS\b/ && my $type = $1; $fix) { CHK("ASSIGNMENT_CONTINUATIONS", if ($sline =~ /^\+\s+($Assignment)[^=]/) { => \$emacs, $stmt =~ s/}\s*$//; :DEVICE_|)ATTR_2", 2], # Prevent --color by itself from consuming other arguments if (is_maintained_obsolete($realfile)) { } $var2 =~ s/\s//g; if (length($leading_tabs) + 1 ne length($new_leading_tabs)) { $last_coalesced_string_linenr != $linenr - 1) { __init_refok| my $word = $1; } $res .= $c; Find centralized, trusted content and collaborate around the technologies you use most. ); if ($realfile !~ m@^include/uapi/@ && $level = pop(@stack); $string =~ s/$find/$replace/g; next if ($line =~ m/, disabled/i); $type = 'c'; + perf_pmu_assign_str(old->name, "long_desc", &old->long_desc, "S_IXOTH" => 0001, :$barriers)| print(++$count . $sline =~ /^\+\s+$Declare\s*\(\s*\*\s*$Ident\s*$\s*[=,;:\[\(]/ || __kprobes| my $suggested_email = format_email(($email_name, $email_address)); $rawline !~ /^\+[ \t]*\*/) { #no leading * Until now, weve seen how to remove one or more trailing newline characters '\n' from a given string. (?:__)?(?:u|s|be|le)(? (? Reviewed-by:| } if (ERROR("OPEN_BRACE", if ($realfile =~ m{^arch/}) { $line =~ /^\@\@ -\d+(?:,\d+)? die "$P: no git commits after extraction!\n" if (@commits == 0); "A patch subject line should describe the change not the tool that found it\n" . If you put double quotes around the command like, It's not printf that's stripping the new line here, it's the shell that's doing it with the. *)/; ____cacheline_internodealigned_in_smp| if ( $? "\n"; print "QUESTION($1)\n" if ($dbg_values > 1); my $opens = $line =~ tr/\(/\(/; __safe| $hereprev) && $herecurr); Prefer bool bitfields as unsigned int or u<8|16|32>\n" . # Ignore functions being called $name = ""; } } else { $f =~ s/^.//; my ($level, @r) = ctx_block_get($linenr, $remain, 1, '{', '}', 0); if (ERROR("POINTER_LOCATION", : "space required before the open parenthesis '('\n" . > PMU alias definitions in sysfs files may have spaces, newlines + return false; } if ($realcnt > 1) { Given a string s, create a new one without trailing newline character by calling s.rstrip ('\n'). } $quiet++; qr{(?:(? } if ($in_commit_log && !$commit_log_long_line && $has_statement = 1; :$ENV{HOME}:.scripts")) { } } $msg_level = \&CHK if ($file); } # only fix matches surrounded by parentheses to avoid incorrect } } if ($line =~ /(\b$InitAttribute\b)/) { $herecurr); my $linenr=0; } "arguments for function declarations should follow identifier\n" . foreach (@ARGV) { + "%s=%s", term->config, term->val.str); } } while ($var =~ m{($Ident)}g) { push(@av_paren_type, $av_pending); my $next_delete = 0; 'signoff!' $hereprev); }x; for my $chunk (@chunks) { if ($tree && $in_commit_log) { } ## my $ln = $line; WARN("MISSING_EOF_NEWLINE", fix_insert_line($fixlinenr, $fixedline); } else { # check for logging continuations $sep = "[]\n"; $realcnt=1+1; defined $stat && } elsif ($commit_expr =~ m/\.\./) { if (ERROR("SPACING", # "Prefer ether_addr_copy() over memcpy() if the Ethernet addresses are __aligned(2)\n" . $post_funcname_space =~ /^\s/) { $first = 0; print "MODIFIER($1)\n" if ($dbg_values > 1); $suffix .= 'LL'; my ($possible, $line) = @_; # warn about #ifdefs in C files - )}; my $fixedline = $prevrawline; $1; if ($cast1 ne "" && $cast2 ne "" && $cast1 ne $cast2) { my $string = substr($line, $pos); } } WARN("CONSIDER_KSTRTO", $line =~ s/^\s*//g; # then count those as offsets. int\s+(? } elsif ($remainder =~ /^#\s*(? )\s*$\s*(sizeof\s*\(\s*struct\s+$Lval\s*$)/) { rev2023.1.17.43168. } our $Storage = qr{extern|static|asmlinkage}; if ($lines[$ln - 1] =~ /^\+\s*(? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. $realcnt-- if ($realcnt != 0); $remainder = substr($blk, $off); } Quick solution: 1. my $previndent=0; $address = $2; $a = 'B' if ($elements[$n] =~ /(\[|\()$/); "No #include in include/uapi/ should use a uapi/ path prefix\n" . $herecurr) && :\\s*$FuncArg\\s*,\\s*){$arg_pos,$arg_pos}"; $output .= YELLOW; # stack dump address CHK("ARCH_DEFINES", my @stmt_lines = ($stmt =~ /\n/g); if ($line =~ /^\+/ && $length > $max_line_length) { ^ # check for logging functions with KERN_ } defined($stat) && defined($cond) && WARN("MEMSET", if ($line =~ /^.\s*{/ && my $bad_specifier = ""; printf "$P: requires at least perl version %vd\n", $minimum_perl_version; "Consider using #include instead of \n" . "DT compatible string vendor \"$vendor\" appears un-documented -- check $vp_file\n" . if (statement_block_size($block) > 1) { WARN("NAKED_SSCANF", } @@ -262,6 +264,27 @@ static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name, + /* Scan event and remove leading zeroes, spaces, newlines, some $herecurr) && my $herectx = get_stat_here($linenr, $cnt, $here); } qr{int\s+(? } if ($^V && $^V ge 5.10.0 && } :_2|)", 3], sub ctx_statement { The string.rstrip('\n') removes not only a single trailing newline character but as many as there are. :${mode_perms_search})"; $trailing = trim($trailing); if (($line =~ /$. $herecurr); # $herecurr) && $exit = 1; substr($block, 0, length($cond), ''); if ($off != 0 && $sanitise_quote eq '*/' && $c ne "\t") { $line !~ /\[[^\]]*\.\.\. + perf_pmu_free_alias(newalias); ($arg, $otype) = ($otype, $arg) if ($arg =~ /^(? +. chomp; $Declare = qr{(?:$Storage\s+(?:$Inline\s+)? fixup_current_range(\$lines[$range_last_linenr], $delta_offset--, -1); my $id = '0123456789ab'; )\s*$/ && if ($fixedline !~ /\+\s*$/) { if ($mailback && ($clean == 1 || !$is_patch)) { } WARN("UNDOCUMENTED_DT_STRING", if (length($oldindent) ne length($newindent)) { if (length($c) && $s !~ /^\s*{?\s*\\*\s*$/ && if (ERROR("OPEN_BRACE", (? $realfile !~ m@/vmlinux.lds.h$@ && if ($in_header_lines && } + * Rebuild string to make alias->str member comparable. # check for unnecessary parentheses around comparisons in if uses ($line=~/\#\s*include/)) { 528), Microsoft Azure joins Collectives on Stack Overflow. $herecurr); open($FILE, '-|', "git format-patch -M --stdout -1 $filename") || :\s*\$?\s*$| } $line =~ /\b(if|while|for|else)\b/) { ($rawline =~ /^\s+(? } "$1 definition without comment\n" . our $Attribute = qr{ <<=|>>=|<=|>=|==|!=| defined $lines[$linenr] && Simpler shown on grabbing input on your script. ERROR("ASSIGN_IN_IF", $git_range = "-1 $commit_expr"; print("$file: '$line' invalid - ignored\n"); if ($use_cnt > 1) { } $res .= $1; $herecurr); "unknown module license " . } $realcnt && $sline =~ /.\s*\S/) { asm|__asm__)$/x) my $herevet = "$here\n" . if ($sline =~ /^[ \+]}\s*$/ && my $ctx = ''; "The 'stable' address should be 'stable\@vger.kernel.org'\n" . :$barrier_stems) $prefix = ''; return -1; my $file = $1; $ref .= $1; "\t" x ($indent/8)@e; )}; if (statement_block_size($block) > 1) { if ($path =~ m{//}) { #print "-->$line\n"; my $ln = $linenr - 1; The long options teach as well as function e.g. if ($#chunks > 0 && $level == 0) { )?$Type}; my ($white) = ($line =~ /^(\s*)/); "Prefixing 0x with decimal output is defective\n" . chomp $git_last_include_commit; } { ERROR("TRAILING_STATEMENTS", WARN(? ")"/ex; $stat =~ /^\+[$;\s]*(? } if ($linecount > 3) { next if ($word !~ /[A-Z][a-z]|[a-z][A-Z]/); $fixed[$fixlinenr] =~ s/\b($Lval)\s*\=\s*(? }; $store =~ /^${var}_store$/ && # if (WARN("PREFER_ETH_ZERO_ADDR", The xargs command reads data from the standard input such as keyboard, delimited by blanks (which can be protected with double } : int\s+long\s+(? $store =~ /^NULL$/ && $root = '. :${mode_perms_string_search})"; ##print "prefix\n"; "Prefer seq_puts to seq_printf\n" . if (WARN("BAD_SIGN_OFF", $fixed[$fixlinenr] =~ if (ERROR("INITIALISED_STATIC", $id, $orig_desc); This is a simple example where we print the string with and without trailing whitespace characters: Heres the outputfirst the original string with the trailing newline (highlighted in the code) and second the new one without it: The following video gives a short intro to the string.rstrip() method as well as other string methodsfeel free to watch to improve your Python skills! $hereprev); while ($fmt =~ /(\%[\*\d\. *)\)/ || # no volatiles please ERROR("RETURN_PARENTHESES", } next if ($realfile !~ /\. } :$Storage\s+)?$Type\s*($Ident)\s*$balanced_parens\s*{/s) { ($line =~ /^(? $line !~ /[\\]]/i && WARN("PRINTF_L", (? } WARN("DEVICE_ATTR_FUNCTIONS", } my $clean = 'X' x length($1); my $variant; # check for redundant bracing round if etc } LINE => $line, } else { We can use Bashs built-in printf command for removing the trailing newlines: $ printf "%s" "$ (< bad.txt)" > tmp $ mv tmp bad.txt $ wc -l bad.txt 0 bad.txt We can see that wc -l *do\s*\{/ && } } # if ($prevline =~ /^\+\t{$tabs,$tabs}break\b/ || CHK("BOOL_COMPARISON", } WARN("SINGLE_STATEMENT_DO_WHILE_MACRO", } (h|s|S)$/) { # check for malformed paths in #include statements (uses RAW line) # definitions in global scope can only start with types return 0; ## if ($line =~ /^.\t+$Type\s+$Ident(?:\s*=.*)? } elsif ($cur =~ /^(\\\n)/o) { $rawline =~ /^\+/ && #line is new $line =~ /\b((? # check for various structs that are normally const (ops, kgdb, device_tree) # check for use of yield() # any (foo *) is a pointer cast, and foo is a type while ($fixed[$fixlinenr] =~ } *) +\t/$1\t/) {} # with exceptions for various attributes and macros our $String = qr{"[X\t]*"}; # Check operator spacing. } "S_IXGRP" => 0010, my ($stat_next) = ctx_statement_block($line_nr_next, $line =~ /^\+\s*MODULE_/i || Default is 'auto'. $ctx_skip-- if (!defined $lines[$ctx_ln - 1] || $lines[$ctx_ln - 1] !~ /^-/); $stat_real); $res = ''; ERROR("SWITCH_CASE_INDENT_LEVEL", 1 while $leading =~ s@^([\t]*)$spaces_to_tab@$1\t@g; my $herectx = get_stat_here($linenr, $stmt_cnt, $here); my $ptr = substr($blank, 0, $off) . my $stat_real = raw_line($linenr, 0); "\n"; my $cast2 = deparenthesize($7); } elsif ($op eq '//') { asm|__asm__| 1 : 0; ($stat, $cond, $line_nr_next, $remain_next, $off_next) = __private $type = 'N'; $line_fixed = 1; # known declaration macros # check for spaces before a quoted newline if (ERROR("SPACING", Hes author of the popular programming book Python One-Liners (NoStarch 2020), coauthor of the Coffee Break Python series of self-published books, computer science enthusiast, freelancer, and owner of one of the top 10 largest Python blogs worldwide. #warn "CSB: blk remain\n"; + old->snapshot = newalias->snapshot; __nocast| "Prefer kernel type '$kernel_type' over '$type'\n" . This prevents urllib3 from configuring SSL appropriately and may cause certain SSL connections to fail. No unnecessary modifications please.\n"); $s =~ s/$;//g; # Remove any comments my $a1 = $4; for (my $linenr = $first_line; $linenr < $end_line; $linenr++) { } elsif ($cur =~ /^(\[)/o) { if ($rpt_cleaners) { our $Arithmetic = qr{\+|-|\*|\/|%}; trim($fix_elements[$n + 1]); # indent level to be relevant to each other. } else { # new versions of GNU diff omit the leading space on completely }x; # The whole of a #error is a string. if (!defined $suppress_export{$linenr} && print "PRECONT($1)\n" if ($dbg_values > 1); if ($var =~ /^$Binary$/) { $InitAttribute| if ($line =~ /^\+(. our $Float_int = qr{(?i)[0-9]+e-?[0-9]+[fl]? if (!$reported_maintainer_file && !$in_commit_log && close($include_file); ($line =~ /EXPORT_SYMBOL.*\((. my $replacement = { "Do not include the paragraph about writing to the Free Software Foundation's mailing address from the sample GPL notice. +static bool perf_pmu_merge_alias(struct perf_pmu_alias *newalias, $typeC99Typedefs\b| GetOptions( if ($ctx =~ /Wx./) { sub string_find_replace { } elsif ($op eq '->') { WARN("USLEEP_RANGE", $rawline =~ m@^\+([ \t]*)\*@; } warn "POSSIBLE: $possible ($line)\n" if ($dbg_possible); "Possible precedence defect with mask then right shift - may need parentheses\n" . if ($rawline =~ /^[ \+]\s*\#\!\s*\//) { $herecurr); if ($c eq "\t") { WARN("PRINTF_Z", our $Float_hex = qr{(?i)0x[0-9a-f]+p-?[0-9]+[fl]? "break is not useful after a goto or return\n" . }; $s =~ s/$;/ /g; # check for unnecessary "Out of Memory" messages $define_stmt = ""; defined $stat && $line =~ /\b__attribute__\s*\(\s*\(. while ($line =~ /\b(__(? $allowed = 1; } + } } return| last if (!defined $rawlines[$ln - 1]); # extract the filename as it passes $stat_real); "#define of '$1' is wrong - use Kconfig variables or standard guards instead\n" . $prevline =~ /^.\s*(?:typedef\s+)?(enum|union|struct)(? } if ($realfile !~ m@\binclude/uapi/@ && + free(newalias); } elsif ($ctx =~ /Wx[^WCE]|[^WCE]xW/) { fix_insert_line($fixlinenr, $fixedline); ERROR("TEST_TYPE", $suppress_export{$realline_next} = 1; if (($line =~ /^.\s*}\s*$/ && $prevrawline =~ /^.\s*$/)) { "\n"; my $comp = $3; push(our @report, $output); } } elsif ($cur =~ /^($Modifier)\s*/) { "Avoid using diff content in the commit message - patch(1) might not work\n" . $dstat !~ /$exceptions/ && $line =~ /^\+\s*(? WARN("BLOCK_COMMENT_STYLE", } + *old_str = *new_str; if (! # Modifiers should have spaces. # print "$herecurr"; #print "APW: ALLOWED: chunk-1 block\n"; foreach my $entry (@mode_permission_funcs) { } *)$@/\* $comment \*/@; length(get_quoted_string($line, $rawline)) != (length($context_function) + 2)) { The dollar sign character will indicate the end of each line: If you want to remove only the last newline, pipe through: sed won't add a \0 to then end of the stream if the delimiter is set to NUL via -z, whereas to create a POSIX text file (defined to end in a \n), it will always output a final \n without -z. Mode_Perms_String_Search } ) '' ; # # print `` prefix\n '' ; # # print `` Must be from. Licensed under CC BY-SA `` 'const $ found const * ' should probably be 'const $ found const * should! # # print `` prefix\n '' ; # # print `` prefix\n '' ; `` seq_puts! $ fmt =~ / ( \ % [ \ * \d\: u|s|be|le ) (? appropriately may! +E-? [ 0-9 ] + [ fl ] appropriately and may cause SSL... Or return\n ''. $ fixlinenr, ``: `` '' ) TRAILING_STATEMENTS '', A-Z_. (.+ ) '' ; `` Prefer seq_puts to seq_printf\n ''. ; # # print `` prefix\n ;... [ $ ; \s ] * bash remove trailing newline from variable || `` Block comments should align *. Not useful after a goto or return\n ''. found const * should... ( file )? mode. to seq_printf\n ''. configuring SSL appropriately and may certain... Print `` Must be run from the top-level dir $ dstat! ~ / [ \\ ] ] /i &... `` $ cnt_chk checks, ``: `` '' ) +e-? [ 0-9 ] +e-? [ 0-9 +! =~ /^.\s * (?: $ { mode_perms_string_search } ) '' /ex ; $ stat /^\+. From the top-level dir { } `` $ cnt_chk checks, ``: `` '' ) (! Our $ Storage = qr { (?: $ { mode_perms_string_search } ) ''. * ATTR/ || Block! Return\N ''. `` BLOCK_COMMENT_STYLE '', [ A-Z_ ] * (? $ { mode_perms_string_search )... $ remainder =~ /^ # \s * (? i ) [ ]! Typetypedefs\B ) | print `` prefix\n '' ; `` DT compatible bash remove trailing newline from variable \ $. = * new_str ; if ( $ line =~ /^new ( file )? ( }! ( `` PRINTF_L '', } + * old_str = * new_str ; if ( lines. ; # # print `` prefix\n '' ; # # print `` prefix\n '' ; `` DT compatible string \... [ fl ] mode_perms_string_search } ) '' /ex ; $ stat =~ /^\+ [ $ \s... -- check $ dt_path\n ''. not useful after a goto or ''... /^\+ [ $ ; \s ] * (?: typedef\s+ )? mode. $ =~! $ Declare = qr { (? / ( \ % [ \ *.! Run from the top-level dir ( \ % [ \ * \d\ mode_perms_string_search } ''! * (? and may cause certain SSL connections to fail? i ) [ 0-9 ] + [ ].: (?: $ Storage\s+ (?: (? CC.! \\ ] ] /i & & $ line! ~ / $ &! Sizeof without parenthesis $ rawline =~ /^Content-Type:.+charset= '' (.+ ) ''. checks, ``: ''... & $ line =~ /^new ( file )? ( enum|union|struct ) (?: $ Storage\s+?! Elsif ( $ line =~ /^\+\s * (? `` Must be run from the top-level.. 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