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Old 10-03-2011, 06:22 PM   #1
FireRaven
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xargs take string as single argument?


Hi, does anyone know if it's possible for xargs to take it's stdin and create 1 single parameter for it.

Example I want this python script's first argument to say 'hello world' like this:
Code:
$ python -c 'import sys;print sys.argv[1]' 'hello world'
hello world
If however I pipe a 'hello world' string to xargs I only get the 'hello' as the first argument and 'world' as the second, but I want them both as the 1st argument:
Code:
$ echo 'hello world' | xargs python -c 'import sys;print sys.argv[1]'
hello
$ echo 'hello world' | xargs python -c 'import sys;print sys.argv[2]'
world
Is there a way for xargs to take a literal input and use just as the first parameter. The idea is to pipe long messages (from emails etc) to the first parameter of a program, so treading all special characters as literals from xargs is what I want.
 
Old 10-03-2011, 06:40 PM   #2
corp769
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Hello,

Would one of the following work?
Code:
echo "\"hello world\"" | xargs python -c 'import sys;print sys.argv[2]'

echo "'hello world'" | xargs python -c 'import sys;print sys.argv[2]'
Cheers,

Josh
 
Old 10-03-2011, 08:23 PM   #3
FireRaven
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Both of those work, but I'm getting my input not from the echo command and the input varies, so quoting is not an option.
The input will be something like:
Code:
$ cat emailmessage | xargs python -c 'import sys;print sys.argv[1]'
 
Old 10-03-2011, 08:30 PM   #4
corp769
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What you could do is create a bash script to cat whatever file you need to a single variable, and then try to pass the variable over to the xargs python part. I'm not on linux right now, so I can't test this and mess around with it for you.
 
Old 10-03-2011, 08:48 PM   #5
ntubski
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xargs can use NUL as an argument separator:
Code:
{ echo 'hello world'; echo -ne '\0' } | xargs -0 python -c 'import sys;print sys.argv[1]'
 
Old 10-03-2011, 09:09 PM   #6
FireRaven
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Quote:
Originally Posted by ntubski View Post
xargs can use NUL as an argument separator:
Code:
{ echo 'hello world'; echo -ne '\0' } | xargs -0 python -c 'import sys;print sys.argv[1]'
That works and will probably do for what I need.
Thanks guys.
 
Old 10-03-2011, 09:35 PM   #7
crts
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alternative

Hi,

just another alternative:
Code:
echo 'hello world' | xargs -I{} python -c 'import sys;print sys.argv[1]' '{}'
 
Old 10-10-2011, 08:36 AM   #8
tange
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Use GNU Parallel:
Code:
$ echo 'hello world' | parallel python -c 'import sys;print sys.argv[1]'
Watch the intro videos to learn more: http://www.youtube.com/watch?v=OpaiGYxkSuQ
 
  


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