Add lines to a file

isra · 03-01-2007, 11:40 AM

hi,
How can i add the output of a command, to some lines of a file?
what i mean is this:
i have this file:
hola adios tschus
bye good gut
and i want to add the output of a command for example 'md5sum' at the end of the first line. So the file will be something like this:
hola adios tschus 3df61431sdfg13opd31sd315 /etc/fstab
bye good gut

anomie · 03-01-2007, 12:11 PM

This question is a bit puzzling. So you want to add a md5 sum and a file name (/etc/fstab in your example) to the end of the first line of a text file? That's it?

nx5000 · 03-01-2007, 12:29 PM

Yeah what's that /etc/fstab?

To add a md5 at line 1, one possibility:

Code:

awk -vval=$(md5sum /tmp/u | cut -f1 -d\ ) 'BEGIN{v2=val} { if (NR==1) {print $0" "v2} else print; }' myfile

isra · 03-01-2007, 12:52 PM

No, in fact is just an example of what is my objective. I want to add at the end of line two or more extra lines in text file that content several lines.

pk2001 · 03-05-2007, 06:20 AM

Assuming that your original text is in "a.txt" and the lines that you want to add in "b.txt" you can use the following command:

cat b.txt >> a.txt

Hope that helps.

pk2001 · 03-05-2007, 06:22 AM

Ok

now I have read your question properly. The output of a command can be added to a file in the same way.
For instance:
ls >> a.txt