command -ubuntu

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WC

-c, --bytes print the byte counts

-m, --chars print the character counts
-l, --lines print the newline counts
--files0-from=F read input from the files specified by
NUL-terminated names in file F;
If F is - then read names from standard input
-L, --max-line-length print the length of the longest line
-w, --words print the word counts
--help display this help and exit
--version output version information and exit

who | wc -l

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command -ubuntu

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原文地址：http://www.cnblogs.com/baxk/p/5085861.html