UNIX Tip: the bad and the good# Unix - 噫吁兮，危乎高哉
w*n
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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
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
