Howto Display text files in a shell script
Posted by Vivek Gite
[Last updated: May 2, 2007]
Q. How do I display a text file stored in /tmp directory in a shell script?
A. There are many ways, you can simply use cat command and display back output on screen or read file line by line and display back the output. In some cases you may need to store output to a variable and later display back on screen.
Task: Display output using cat command
Following sample script displays contents of a file called /tmp/input.txt:
#!/bin/bash FILE="/tmp/input.txt" echo "*** File - $FILE contents ***" cat $FILE
Task: Store a file output in a variable
Following sample script displays nameserver IPs:
#!/bin/bash
FILE="/etc/resolv.conf"
OUT=$(awk '{ print $2 }' $FILE)
echo "*** Nameserver IP ***"
for ip in $OUT
do
echo $ip
done
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November 1st, 2007 at 12:30 pm
2nd option is good. If file is large, one can modify the script a bit to serve the purpose.
December 19th, 2007 at 9:25 pm
How to display certain part of a file? For example, I have a file myFile.Java and I would like to display the contents between lines 30-40. How to do that in linux? with cat?
Thanks,