grep, egrep & fgrep Command | Find your pattern anywhere | Linux Tutorials | Parsutech 🔥🔥🔥🔥🔥🔥
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Grep is not needed if we know sed command.
Grep command is used to grep some data from a file.
Grep root passwd:- root keyword search in the file passwd.it will retrieve the lines which contains root.
Grep n root passwd: it will also show the number of line which contains this keyword.
Grep ni Root passwd: it will ignore the uppercase or lowercase syntax.
Grep nio root passwd: it will only give the root occurrence not full line.
Grep nic root passwd: it will give the answer that how many line contains root keyword.
Grep -ni ^root passwd:-only those lines will be in the output which contains root at the starting position.
Grep ni root$ passwd: only those lines will be in the output which contains root at the last.
Grep -n -A2 root passwd:-print the line where root exist and along with its next two lines.
Grep n -B2 root passwd: print the line where root exist and also print its previous two lines.
Grep n -C2 root passwd: print the line where root exist and also print its previous two and next two lines.
(Grep E)/egrep -n ‘root|ftp|mail’ passwd: print the all lines which contains root,ftp and mail patterns.
Grep -n “ftp (enter)
Ntp (enter)
Admin” passwd:- this command is used to search multiple patterns in the single file.
Grep -F -n root passwd cloudfile:-F option is used to search a pattern in multiple file but with an update in the grep command now we don’t need to write F option in the command.
Grep n -r root /etc/: it will search in the all files of the etc directory and find root pattern.if R(capital) option is used then it will search the pattern in all the link file also.
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