w*****n
发帖数: 94 | 1 THE BAD AND THE GOOD
I cringe anytime I see someone code inefficiently. Here are
three of the most common mistakes, followed by a better way to
do the same thing.
Bad: cat somefile | grep something
Better: grep something somefile
Why: You're running one program (grep) instead of two (cat
and grep).
Bad: ps -ef | grep something | grep -v grep
Better: ps -ef | grep [s]omething
Why: You抮e running two commands (grep) instead of three (ps
and two greps).
Bad: cat /dev/null > somefile | c*****t
发帖数: 1879 | 2 The later two tips work for /bin/sh (or bash) only.
【在 w*****n 的大作中提到】
: THE BAD AND THE GOOD
: I cringe anytime I see someone code inefficiently. Here are
: three of the most common mistakes, followed by a better way to
: do the same thing.
: Bad: cat somefile | grep something
: Better: grep something somefile
: Why: You're running one program (grep) instead of two (cat
: and grep).
: Bad: ps -ef | grep something | grep -v grep
: Better: ps -ef | grep [s]omething
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