bash - How to print out the number of lines in an output command -

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for example:

cat /etc/passwd

what easiest way count , display number of lines command outputs?

wc unix utility counts characters, words, lines etc. try man wc learn more it. -l option makes print number of lines (and not characters , other stuff).

so, wc -l <filename> print number of lines in file <filename>.

you asked how count number of lines output command line program in general. that, can use pipes in unix. so, can pipe output of command wc -l. in example, cat /etc/password command line program want count. should do:

cat /etc/password | wc -l

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