Sed: Difference between revisions
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=Basics= | =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> | ;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. | ||
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:\1 and \2 refer to the subpatterns between brackets (). | :\1 and \2 refer to the subpatterns between brackets (). | ||
;sed '/<pattern>/ | ;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. | |||
Revision as of 10:45, 6 November 2019
Check the APO unix pages for more.
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.
- 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.