sort the contents of a text file in place.

sort -g -o list.txt{,}
sorts the contents of a file without the need for a second file to take the sorted output. This was previously entered as `sort -g list.txt -o $_` but as others have pointed out the $_ references the previous command. so this would've worked had that been the second part of a command joined with && like: cat list.txt && sort -g list.txt -o $_ The user below me Robin had the most correct command.
Sample Output
Ape
apple
Apple
Banana
Harold Kumar Digby
harry
Tape
001
01
1


10
By: jambino
2011-11-15 19:59:28

What Others Think

The $_ shell variable expands to the last argument to the previous command. You could use brace expansion, like this: sort -g -o list.txt{,} or history expansion, like this: sort -g -o list.txt !#:$ or sort -g list.txt -o !#:2
Robin · 517 weeks and 6 days ago
Since "$_" expands to the last argument of the previous command, it will fail if list.txt is not referenced previously A better approach is to use history reference "!^" to the first argument (non-option) of the current command: sort -g list.txt -o !^
caruccio · 477 weeks and 1 day ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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