Difference between revisions of "Linux/Unix:Find and Replace"
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Line 3: | Line 3: | ||
==cat== | ==cat== | ||
− | ==head tail== | + | ==head & tail== |
− | Show only top or | + | Show only top or bottom lines from a file |
;tail <num> filename | ;tail <num> filename | ||
:Show the last <num> lines from filename. 10 is the default | :Show the last <num> lines from filename. 10 is the default | ||
+ | ;tail -f filename | ||
+ | :Keep showing all files appended to the file | ||
;head -<num> filename | ;head -<num> filename | ||
:Show the first <num> lines from filename. 10 is the default | :Show the first <num> lines from filename. 10 is the default | ||
+ | ;head -n -<num> filename | ||
+ | :Show all except the last <num> lines from filename | ||
;tail +<num> filename | ;tail +<num> filename | ||
:Show all lines from line <num> onwards | :Show all lines from line <num> onwards |
Revision as of 10:30, 28 July 2020
cat
head & tail
Show only top or bottom lines from a file
- tail <num> filename
- Show the last <num> lines from filename. 10 is the default
- tail -f filename
- Keep showing all files appended to the file
- head -<num> filename
- Show the first <num> lines from filename. 10 is the default
- head -n -<num> filename
- Show all except the last <num> lines from filename
- 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.