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Top Forums Shell Programming and Scripting How to save sorted content of a inside the same file? Post 302918408 by rbatte1 on Tuesday 23rd of September 2014 06:34:01 AM
Old 09-23-2014
This is a common problem. When you run the command, the output file is opened (and overwritten) before you start to read the input, which by now is null. You command then exists as it finishes reading no input.

You will need to read the input and write to a separate output file. If need be, then rename (and overwrite) the input file thus:-
Code:
sort -o output input
mv output input

It does mean that you have to consider space for having the two files at the same time, even if just for a moment.



Robin
 

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Test::use::ok(3)					User Contributed Perl Documentation					  Test::use::ok(3)

NAME
Test::use::ok - Alternative to Test::More::use_ok SYNOPSIS
use ok 'Some::Module'; DESCRIPTION
According to the Test::More documentation, it is recommended to run "use_ok()" inside a "BEGIN" block, so functions are exported at compile-time and prototypes are properly honored. That is, instead of writing this: use_ok( 'Some::Module' ); use_ok( 'Other::Module' ); One should write this: BEGIN { use_ok( 'Some::Module' ); } BEGIN { use_ok( 'Other::Module' ); } However, people often either forget to add "BEGIN", or mistakenly group "use_ok" with other tests in a single "BEGIN" block, which can create subtle differences in execution order. With this module, simply change all "use_ok" in test scripts to "use ok", and they will be executed at "BEGIN" time. The explicit space after "use" makes it clear that this is a single compile-time action. SEE ALSO
Test::More CC0 1.0 Universal To the extent possible under law, XX has waived all copyright and related or neighboring rights to Test-use-ok. This work is published from Taiwan. <http://creativecommons.org/publicdomain/zero/1.0> POD ERRORS
Hey! The above document had some coding errors, which are explained below: Around line 45: Non-ASCII character seen before =encoding in 'XX'. Assuming UTF-8 perl v5.18.2 2012-09-11 Test::use::ok(3)
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