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Old 05-07-2012, 08:54 PM   #1
romeo0307
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Adding output of one command to the bottom of another file?


Hi guys. It's me again

Here is what I have this time:

paste -d: file1 file 2

This needs to be combined with another command to make it 1 command using either | or > or something like that.

And it needs to go to the bottom of file3

Please help!
 
Old 05-07-2012, 08:56 PM   #2
suicidaleggroll
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You need to be more specific. What is the other command? What are you trying to put into file3? The more specific you are, the faster and more accurate the advice will be.

In general, ">>" will append the output of a command to the end of a file, IE: "ls >> outfile"

Last edited by suicidaleggroll; 05-07-2012 at 08:57 PM.
 
Old 05-07-2012, 08:59 PM   #3
sycamorex
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Yes, you are on the right track. Apart from the piper character '|', make sure you know the difference between > and >>
 
Old 05-07-2012, 09:00 PM   #4
romeo0307
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Quote:
Originally Posted by suicidaleggroll View Post
You need to be more specific. What is the other command? What are you trying to put into file3? The more specific you are, the faster and more accurate the advice will be.

In general, ">>" will append the output of a command to the end of a file, IE: "ls >> outfile"
Duh! Thanks, that was so simple.
 
Old 05-08-2012, 03:09 PM   #5
David the H.
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Yes, the usual, recommended way is just to do something like this:

Code:
command1 > file
command2 >> file
It's also possible to use command grouping or subshells to direct the output of multiple commands at once.

Code:
{ command1 ; command2 ; } > outfile

( command1 ; command2 ) > outfile
Finally, you can use cat and process substitution to combine multiple inputs together. This works well when you want to combine output form both files and commands.

Code:
cat infile1 <(command1) infile2 <(command2) >outfile
 
  


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