Home / Cheatsheets / sed
Contents
- Overview
- 3 solutions to only output matching lines:
- Only output lines up to but not including the line with the SEARCH-STRING.
- Only print lines after and including the line with the SEARCH-STRING.
- Delete text between two matching lines
- Case insensitive search/replace
- Edit first line only
Overview
-i - edit file in place.
3 solutions to only output matching lines:
> cat file | sed -n "/abc/p"
# Without -n option. t - skips all further commands, d - deletes the line.
> cat file | sed "s/\(abc\)/\1/;t;d"
# As above but also print first line.
> cat file | sed "1p;t; s/\(abc\)/\1/;t;d"
Only output lines up to but not including the line with the SEARCH-STRING.
> sed -n '/^SEARCH-STRING/q;p' file
Only print lines after and including the line with the SEARCH-STRING.
> sed -n '/^SEARCH-STRING/,$p' file
Delete text between two matching lines
# Delete including matching lines
> cat file | sed sed '/^startstring/,/^endstring}/d'
# Delete excluding matching lines
> cat file | sed sed '/^startstring/,/^endstring}/{//!d;}'
Case insensitive search/replace
sed 's/one/two/I'
Edit first line only
sed -i "1s/hello/goodbye/" <file>
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