Using sed between specific lines only
Question
I have this sed command for removing the spaces after commas.
sed -e 's/,\s\+/,/g' example.txt
How can i change it that, it will make the modification between only specific line numbers.
(eg between second and third lines).
3 answers
solution1
32 ACCPTED 2013-04-24 21:57:54
Use:
sed '2,3s/,\s\+/,/g' example.txt
This will apply the regex /,\s\+/ only in the lines numbered 2 to 3 (inclusive) and substitute the match with , .
solution2
9 2013-04-25 04:27:01
Since OSX (BSD sed) has some syntax differences to linux (GNU) sed, thought I'd add the following from some hard-won notes of mine:
OSX (BSD) SED find/replace within (address) block (start and end point patterns(/../) or line #s) in same file ( via & via &via & section 4.20 here ):
Syntax:
$ sed '/start_pattern/,/end_pattern/ [operations]' [target filename]
Standard find/replace examples:
$ sed -i '' '2,3 s/,\s\+/,/g' example.txt
$ sed -i '' '/DOCTYPE/,/body/ s/,\s\+/,/g' example.txt
Find/replace example with complex operator and grouping (cannot operate without grouping syntax due to stream use of standard input). All statements in grouping must be on separate lines, or separated w/ semi-colons:
Complex Operator Example (will delete entire line containing a match):
$ sed -i '' '2,3 {/pattern/d;}' example.txt
Multi-file find + sed:
$ find ./ -type f -name '*.html' | xargs sed -i '' '/<head>/,/<\/head>/ {/pattern/d; /pattern2/d;}'
Hope this helps someone!
solution3
1 2013-04-24 21:57:45
sed -e '2,3!b;s/,\s\+/,/g' example.txt
如果您以后想要添加更多命令来处理所需的行，此版本可能很有用。
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