Difference between revisions of "Sed"
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Check the [https://unix.antiperfect.org/scripting/sed/ APO unix pages] for more. | Check the [https://unix.antiperfect.org/scripting/sed/ APO unix pages] for more. | ||
| + | |||
| + | ;NOTE!! On some systems you need the -E option to have possix [[Regular Expressions]] supported | ||
=Tricks= | =Tricks= | ||
;<code>sed 's/\r//' filename > newfilename</code> | ;<code>sed 's/\r//' filename > newfilename</code> | ||
| − | :dos2unix substitute, remove all | + | :dos2unix substitute, remove all DOS line endings. |
;<code>sed -i 'commands' filename</code> | ;<code>sed -i 'commands' filename</code> | ||
| − | :Edit the file directly (inplace) by default the result is sent to standard output | + | :Edit the file directly (inplace), by default the result is sent to standard output. |
=Basics= | =Basics= | ||
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;sed 's/<old_string>/<new_string>/g' <file> | ;sed 's/<old_string>/<new_string>/g' <file> | ||
| − | :Substitute, no whitespace is allowed after the command (s), the first character following s is the fieldseperator./g substitutes all matching patterns in a line. | + | :Substitute, no whitespace is allowed after the command (s), the first character following s is the fieldseperator./g substitutes all matching patterns in a line. Use \n to insert a newline. |
;sed 's/pattern(with)sub(patterns)/\1 newpartofstring \2/' <file> | ;sed 's/pattern(with)sub(patterns)/\1 newpartofstring \2/' <file> | ||
Latest revision as of 09:44, 21 March 2023
Check the APO unix pages for more.
- NOTE!! On some systems you need the -E option to have possix Regular Expressions supported
Tricks
sed 's/\r//' filename > newfilename- dos2unix substitute, remove all DOS line endings.
sed -i 'commands' filename- Edit the file directly (inplace), by default the result is sent to standard output.
Basics
- sed '/<pattern>/<action>' <file>
- Execute action on all lines in <file> matching <pattern>
- Simple actions are d(elete) (can be negated using !d, delete all lines not matching), p(rint), q(uit)
- sed 's/<old_string>/<new_string>/g' <file>
- Substitute, no whitespace is allowed after the command (s), the first character following s is the fieldseperator./g substitutes all matching patterns in a line. Use \n to insert a newline.
- sed 's/pattern(with)sub(patterns)/\1 newpartofstring \2/' <file>
- \1 and \2 refer to the subpatterns between brackets ().
- sed '/<pattern>/[ia]<text>'
- i inserts <text> before the matched line, a after the line
- sed '/<pattern>/[rw] <file>'
- r(ead) from or w(rite) to <file> if <pattern> is matched.