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Old 30th August 2010
Rubiks Rubiks is offline
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Default Executing Builtin with xargs issue

System: Mac OS X 10.6.4

Problem - returning history id through History command and passing to xargs results in failure.

My complete line is: history | grep -m 1 -v -e"history" | awk '/open.*25-2010/ {print $1}' | xargs !

Which basically prints out the identifier (12) for the full line of
12 open ~/Documents/log/08-25-2010.rtf

With 12 being passed to xargs "!12" i get the error:
xargs: !: No such file or directory

I've confirmed by leaving xargs blank that it does receive 12, because that's all it prints out.

From my reading it seems like the problem could be executing a shell script (per man history) within a execution utility.

I'd appreciate if anyone can confim my theory, if they can provide more useful things to read on the man pages, or contribute more things to test out.

The reason I'm using this complicated line instead of ctrl+r is that it seems ctrl doesn't allow me to use the same patterns as I want to in awk or grep.
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Old 31st August 2010
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s0xxx s0xxx is offline
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Posts: 192

I will not try to correct your solution, but rather dare to try to give mine for your problem. We also try to eliminate grep, and give opportunity to search:
$ echo "1,2,3" >/tmp/something
$ echo "4,5,6" >/tmp/something2
$ echo "7,8,9" >/tmp/someother
$ history -c

$ cat /tmp/something
$ cat /tmp/something2
$ cat /tmp/someother

$ aaa(){ a=$1; history | awk -vc="$a" '!/aaa/&&$0~c{print $2,$3}' | sh; }
$ aaa something
$ aaa someother
$ aaa some.*
In order for this to work properly, you should instruct bash to not duplicate same commands in history:
$ export HISTCONTROL='ignoredups'
The best way to learn UNIX is to play with it, and the harder you play, the more you learn.
If you play hard enough, you'll break something for sure, and having to fix a badly broken system is arguably the fastest way of all to learn. -Michael Lucas, AbsoluteBSD

Last edited by s0xxx; 31st August 2010 at 02:21 PM. Reason: corrected mistake
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