egrep
egrep [xyz] /etc/passwd
egrep x:[0-9]{3} /etc/passwd
egrep ^r /etc/passwd
egrep '[bash!false]' /etc/passwd
For example, the following will display either Manager or Developer (bot ignore Sales).
For example, the following will display either Manager or Developer (bot ignore Sales).
$ egrep 'Manager|Developer' employee.txt | grep -v Sales
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