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grep with Basic Regular Expressions

$ grep root /etc/passwd root:x:0:0:root:/root:/bin/bash operator:x:11:0:operator:/root:/sbin/nologin

grep • Difference between grep, egrep, fgrep, pgrep.

$ egrep '^(0|1)+ [a-zA-Z]+$' searchfile.txt 011 AaBBS

grep • Difference between grep, egrep, fgrep, pgrep.

$ fgrep "." .bashrc # will match lines with a dot.

grep • Difference between grep, egrep, fgrep, pgrep.

$ pgrep python 1299

grep • Difference between grep, egrep, fgrep, pgrep.