Unix Tip: CUT FROM STANDARD COMMANDS

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UNIX HOT TIP

Unix Tip 3491 - August 31, 2013

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CUT FROM STANDARD COMMANDS

To properly cut the output of
unix standard commands; such
as ls, ps; and properly handle
them without all the extra
spaces, use this:

% ls -lt| tr -s " " | cut -f6-10
% ls -lt| tr -s " " | < --do what ever-- >

tr -s " " ==> here tr in
effect removes all the extra
formatting extra spaces
introduced by unix shell,
for display, and translates
in to format easy to work
with.

If we dont use this tr, then
the -c option of cut will be
unreliable because of varying
size field lengths in the
output and also -f option
will be unreliable because of
extra formatting delimiters.

ls -lt | tr -s " "
ps -ef | tr -s " "

gives us proper output to
properly extract data or
columns.

This tip generously supported by: snlmurthy@yahoo.com


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