21 lines
1.4 KiB
Text
21 lines
1.4 KiB
Text
grep a matches.txt # find lines containing 'a'
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grep ab matches.txt # find lines containing 'abc'
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grep '^ab$' matches.txt # find lines starting with 'abc'
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grep "[hat]" matches.txt # find lines containing h, a or t
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grep -E "[abc]{3,4}" matches.txt # find strings with 3 or 4 successive combination of a, b or c
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grep -E -n -o "[abc]{3,4}" matches.txt # show line numbers and matches only
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ip addr | egrep "([0-9]{1,3}\.){3}[0-9]{1,3}" # find IP addresses
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ip addr | egrep "([[:xdigit:]]{2}:){5}[[:xdigit:]]{2}" # find MAC Addresses
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grep "[[:punct:]]" matches.txt # find punctuation
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grep "[linux]{3,5}" regex.examples # find l,i,n,u, or x in a pattern between 3 to 5 characters
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egrep "[linux]{3,5}" regex.examples # did it work now?
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grep '[[:alpha:]]' regex.examples # find lettes
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fgrep '[[:alpha:]]' regex.examples # find the single quote enclosed string explicitly
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grep "[[:blank:]]" matches.txt # find space or tab
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grep "[[:space:]]" matches.txt # find all whitespace
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grep "[[:blank:]]$" matches.txt # find space or tab at the line’s end
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grep "[[:space:]]$" matches.txt # find whitespace at the line’s end
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grep -i uuid /etc/fstab # find the 'uuid' string
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sed -e 's/UUID/uuid' /etc/fstab | grep uuid # case sensitive
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sed 's/UUID/UUID UUID/' /etc/fstab | sed 's/UUID/uuid/' # replace only the first match of UUID
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sed 's/UUID/UUID UUID/' /etc/fstab | sed 's/UUID/uuid/g' # replace all matches of UUID
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