UNIX commands

Scientific Computing Linux Unix


Terminal Linux-Unix Tools: pr, cut, grep...

This post collects a list of shorts tips related with UNIX terminal tools. To extract information of a file, to find specific archives, etc …

awk and pr

AWK (or gawk) is a quite powerful line command. This is an example of how to combine it with pr. The pr command is useful to, for example, create a file with two columns from two previous one column files (or more complex operations).

The next example is based on a very simple file test-file.dat

a  1   house   hause
b  2     day   tag
h  7   cinema  kino
u  23  chess   schach

You can simply try!

cp test-file.dat del_later
gawk '{print $1 }' del_later > COL1; more COL1
gawk '{print $2 }' del_later > COL2; more COL2
gawk '{print $3 }' del_later > COL3; more COL3
gawk '{print $2, $NF }' del_later > COL2_last; more COL2_last
gawk '{print $3, $NF }' del_later > COL3_last; more COL3_last
pr -m -t -s\ COL2_last COL3_last


cut may be used to select an specific column number

cut -f 
cut -c 129 file.txt > new_file.txt
ln -s orginal_filename  newsoftlink_filename


Gives a list of those processes in background in the current shell session


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