Text and log filtering in shell programming

1: grep command:

Grep-v "char" file_name match text that does not contain "char"

Grep-n-w "char" file_name completely matches a character

Grep ^ s $ s is the text that matches the first or last row of s.

2: tr command

Tr set1 set2 replace set set1 with set2

Tr-s set1 compressed character

Tr-t ":" The default Delimiter is space.

Tr-d "set" deletes all characters in the set from the text

3: seq commands are used to generate sequences.

Seq 1 10 generates a sequence from 1 to 10 with line breaks as the Separator

Seq-s "" 1 + 2 10 specifies the separator as space, and the sequence increment is 2

4: The sort command is generally used with the uniq command for sorting.

Ls/boot | sort-n-k5-n indicates that the values are sorted by numbers, and-k 5 indicates that the values are listed as standard by 5th.

5: uniq for Statistics

Uniq-c: count the number of the same rows

6: cut is used to cut characters or lines

Cut-d ""-f 5/etc/passwd-d "" specifies the delimiter as a space and only displays the 5th regions.

Ls/boot | cut-c 5 truncates the fifth character

Cut-B 5 truncates the fifth byte.