Difference between revisions of "Linux/Unix:Find and Replace"
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m (Hdridder moved page Bash:Find and Replace to Linux/Unix:Find and Replace) |
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==head tail== | ==head tail== | ||
+ | |||
+ | Show only top or trailing line from a file | ||
+ | ;tail <num> filename | ||
+ | :Show the last <num> lines from filename. 10 is the default | ||
+ | ;head -<num> filename | ||
+ | :Show the first <num> lines from filename. 10 is the default | ||
+ | ;tail +<num> filename | ||
+ | :Show all lines from line <num> onwards | ||
+ | |||
+ | ;tail +<lineno> filename|head -<num> | ||
+ | :show <num> lines starting at <lineno> | ||
==fold== | ==fold== |
Revision as of 10:22, 28 July 2020
cat
head tail
Show only top or trailing line from a file
- tail <num> filename
- Show the last <num> lines from filename. 10 is the default
- head -<num> filename
- Show the first <num> lines from filename. 10 is the default
- tail +<num> filename
- Show all lines from line <num> onwards
- tail +<lineno> filename|head -<num>
- show <num> lines starting at <lineno>
fold
strings
more less
tr
- tr "[:upper:]" "[:lower:]"
- tr "[abc]" "[xyz]"
- Transtlate, make all lowercase
- replace all a's with y, all b's with y and all c's with z, works from stdin to stdout. All sort of translations can be done
- tr -d <char>
- Delete <char> from standard input
grep
sed
- s/pattern/newstring/
- In each line replace first occurrence of pattern with newstring. /g at the end replaces all occurrences of pattern.
- s/pattern/d
- Delete each line matching pattern.