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| 关键词： SED line lines method print file regexp emulates only AAA |
HANDY ONE-LINERS FOR SED (Unix stream editor) Mar. 23, 2001.compiled by Eric Pement <[email protected]> version 5.1 .Latest version of this file is usually at: http://www.student.northpark.edu/pemente/sed/sed1line.txt http://www.cornerstonemag.com/sed/sed1line.txt This file is also available in Portuguese at: http://www.lrv.ufsc.br/wmaker/sed_ptBR.html FILE SPACING-----------------: # double space a file sed G # double space a file which already has blank lines in it. Output file # should contain no more than one blank line between lines of text. sed '/^$/d;G' # triple space a file sed 'G;G' # undo double-spacing (assumes even-numbered lines are always blank) sed 'n;d' NUMBERING: # number each line of a file (simple left alignment). Using a tab (see # note on '\t' at end of file) instead of space will preserve margins. sed = filename | sed 'N;s/\n/\t/' # number each line of a file (number on left, right-aligned) sed = filename | sed 'N; s/^/ /; s/ *\(.\{6,\}\)\n/\1 /' # number each line of file, but only print numbers if line is not blank sed '/./=' filename | sed '/./N; s/\n/ /' # count lines (emulates ""wc -l"") sed -n '$=' TEXT CONVERSION AND SUBSTITUTION: # IN UNIX ENVIRONMENT: convert DOS newlines (CR/LF) to Unix format sed 's/.$//' # assumes that all lines end with CR/LF sed 's/^M$//' # in bash/tcsh, press Ctrl-V then Ctrl-M sed 's/\x0D$//' # gsed 3.02.80, but top script is easier # IN UNIX ENVIRONMENT: convert Unix newlines (LF) to DOS format sed ""s/$/`echo -e \\\r`/"" # command line under ksh sed 's/$'""/`echo \\\r`/"" # command line under bash sed ""s/$/`echo \\\r`/"" # command line under zsh sed 's/$/\r/' # gsed 3.02.80 # IN DOS ENVIRONMENT: convert Unix newlines (LF) to DOS format sed ""s/$//"" # method 1 sed -n p # method 2 # IN DOS ENVIRONMENT: convert DOS newlines (CR/LF) to Unix format # Cannot be done with DOS versions of sed. Use ""tr"" instead. tr -d \r <infile >outfile # GNU tr version 1.22 or higher # delete leading whitespace (spaces, tabs) from front of each line # aligns all text flush left sed 's/^[ \t]*//' # see note on '\t' at end of file # delete trailing whitespace (spaces, tabs) from end of each line sed 's/[ \t]*$//' # see note on '\t' at end of file # delete BOTH leading and trailing whitespace from each line sed 's/^[ \t]*//;s/[ \t]*$//' # insert 5 blank spaces at beginning of each line (make page offset) sed 's/^/ /' # align all text flush right on a 79-column width sed -e :a -e 's/^.\{1,78\}$/ &/;ta' # set at 78 plus 1 space # center all text in the middle of 79-column width. In method 1, # spaces at the beginning of the line are significant, and trailing # spaces are appended at the end of the line. In method 2, spaces at # the beginning of the line are discarded in centering the line, and # no trailing spaces appear at the end of lines. sed -e :a -e 's/^.\{1,77\}$/ & /;ta' # method 1 sed -e :a -e 's/^.\{1,77\}$/ &/;ta' -e 's/\( *\)\1/\1/' # method 2 # substitute (find and replace) ""foo"" with ""bar"" on each line sed 's/foo/bar/' # replaces only 1st instance in a line sed 's/foo/bar/4' # replaces only 4th instance in a line sed 's/foo/bar/g' # replaces ALL instances in a line sed 's/\(.*\)foo\(.*foo\)/\1bar\2/' # replace the next-to-last case sed 's/\(.*\)foo/\1bar/' # replace only the last case # substitute ""foo"" with ""bar"" ONLY for lines which contain ""baz"" sed '/baz/s/foo/bar/g' # substitute ""foo"" with ""bar"" EXCEPT for lines which contain ""baz"" sed '/baz/!s/foo/bar/g' # change ""scarlet"" or ""ruby"" or ""puce"" to ""red"" sed 's/scarlet/red/g;s/ruby/red/g;s/puce/red/g' # most seds gsed 's/scarlet\|ruby\|puce/red/g' # GNU sed only # reverse order of lines (emulates ""tac"") # bug/feature in HHsed v1.5 causes blank lines to be deleted sed '1!G;h;$!d' # method 1 sed -n '1!G;h;$p' # method 2 # reverse each character on the line (emulates ""rev"") sed '/\n/!G;s/\(.\)\(.*\n\)/&\2\1/;//D;s/.//' # join pairs of lines side-by-side (like ""paste"") sed '$!N;s/\n/ /' # if a line ends with a backslash, append the next line to it sed -e :a -e '/\\$/N; s/\\\n//; ta' # if a line begins with an equal sign, append it to the previous line # and replace the ""="" with a single space sed -e :a -e '$!N;s/\n=/ /;ta' -e 'P;D' # add commas to numeric strings, changing ""1234567"" to ""1,234,567"" gsed ':a;s/\B[0-9]\{3\}\>/,&/;ta' # GNU sed sed -e :a -e 's/\(.*[0-9]\)\([0-9]\{3\}\)/\1,\2/;ta' # other seds # add commas to numbers with decimal points and minus signs (GNU sed) gsed ':a;s/\(^\|[^0-9.]\)\([0-9]\+\)\([0-9]\{3\}\)/\1\2,\3/g;ta' # add a blank line every 5 lines (after lines 5, 10, 15, 20, etc.) gsed '0~5G' # GNU sed only sed 'n;n;n;n;G;' # other seds SELECTIVE PRINTING OF CERTAIN LINES: # print first 10 lines of file (emulates behavior of ""head"") sed 10q # print first line of file (emulates ""head -1"") sed q # print the last 10 lines of a file (emulates ""tail"") sed -e :a -e '$q;N;11,$D;ba' # print the last 2 lines of a file (emulates ""tail -2"") sed '$!N;$!D' # print the last line of a file (emulates ""tail -1"") sed '$!d' # method 1 sed -n '$p' # method 2 # print only lines which match regular expression (emulates ""grep"") sed -n '/regexp/p' # method 1 sed '/regexp/!d' # method 2 # print only lines which do NOT match regexp (emulates ""grep -v"") sed -n '/regexp/!p' # method 1, corresponds to above sed '/regexp/d' # method 2, simpler syntax # print the line immediately before a regexp, but not the line # containing the regexp sed -n '/regexp/{g;1!p;};h' # print the line immediately after a regexp, but not the line # containing the regexp sed -n '/regexp/{n;p;}' # print 1 line of context before and after regexp, with line number # indicating where the regexp occurred (similar to ""grep -A1 -B1"") sed -n -e '/regexp/{=;x;1!p;g;$!N;p;D;}' -e h # grep for AAA and BBB and CCC (in any order) sed '/AAA/!d; /BBB/!d; /CCC/!d' # grep for AAA and BBB and CCC (in that order) sed '/AAA.*BBB.*CCC/!d' # grep for AAA or BBB or CCC (emulates ""egrep"") sed -e '/AAA/b' -e '/BBB/b' -e '/CCC/b' -e d # most seds gsed '/AAA\|BBB\|CCC/!d' # GNU sed only # print paragraph if it contains AAA (blank lines separate paragraphs) # HHsed v1.5 must insert a 'G;' after 'x;' in the next 3 scripts below sed -e '/./{H;$!d;}' -e 'x;/AAA/!d;' # print paragraph if it contains AAA and BBB and CCC (in any order) sed -e '/./{H;$!d;}' -e 'x;/AAA/!d;/BBB/!d;/CCC/!d' # print paragraph if it contains AAA or BBB or CCC sed -e '/./{H;$!d;}' -e 'x;/AAA/b' -e '/BBB/b' -e '/CCC/b' -e d gsed '/./{H;$!d;};x;/AAA\|BBB\|CCC/b;d' # GNU sed only # print only lines of 65 characters or longer sed -n '/^.\{65\}/p' # print only lines of less than 65 characters sed -n '/^.\{65\}/!p' # method 1, corresponds to above sed '/^.\{65\}/d' # method 2, simpler syntax # print section of file from regular expression to end of file sed -n '/regexp/,$p' # print section of file based on line numbers (lines 8-12, inclusive) sed -n '8,12p' # method 1 sed '8,12!d' # method 2 # print line number 52 sed -n '52p' # method 1 sed '52!d' # method 2 sed '52q;d' # method 3, efficient on large files # beginning at line 3, print every 7th line gsed -n '3~7p' # GNU sed only sed -n '3,${p;n;n;n;n;n;n;}' # other seds # print section of file between two regular expressions (inclusive) sed -n '/Iowa/,/Montana/p' # case sensitive SELECTIVE DELETION OF CERTAIN LINES: # print all of file EXCEPT section between 2 regular expressions sed '/Iowa/,/Montana/d' # delete duplicate, consecutive lines from a file (emulates ""uniq""). # First line in a set of duplicate lines is kept, rest are deleted. sed '$!N; /^\(.*\)\n\1$/!P; D' # delete duplicate, nonconsecutive lines from a file. Beware not to # overflow the buffer size of the hold space, or else use GNU sed. sed -n 'G; s/ |
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