egrep — Search a file for a specified pattern

Format

egrep [–Bbcilnqsvx] [-W option[,option]...] [–e pattern] … [–f patternfile] … [pattern] [file …]

Guideline: The egrep utility is fully supported for compatibility with older UNIX systems. However, use grep –E instead because it may provide greater functionality and is considered the standard for portable UNIX applications as defined by POSIX.2 IEEE standard 1003.2-1992.