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Shell Programming and Scripting
How to read file, and replace certain string with another string?
Post 302927710 by junior-helper on Friday 5th of December 2014 12:05:33 AM
12-05-2014
Quote:
#!/bin/bash
awk '{
print "$1;
}' net.txt > net-mask.txt
awk '{
print "$1;
}' net.txt > net-mask.txt
Apart from that, in this particular case (input file contains only one column) the above code is essentially the same as cp net.txt net-mask.txt
Quote:
Please let me know where is the best place to put “sed” into my shell script file.
Code:
#!/bin/bash
awk '{
print $1;
}' net.txt > net-mask.txt
sed -i 's/\/8/ 255.0.0.0/' net-mask.txt
sed -i 's/\/16/ 255.255.0.0/' net-mask.txt
sed -i 's/\/24/ 255.255.255.0/' net-mask.txtCode:
sed 's/\/8/ 255.0.0.0/' net-mask.txt > net-mask.temp mv net-mask.temp net-mask.txt sed 's/\/16/ 255.255.0.0/' net-mask.txt > net-mask.temp mv net-mask.temp net-mask.txt sed 's/\/24/ 255.255.255.0/' net-mask.txt > net-mask.temp mv net-mask.temp net-mask.txt
Quote:
And of course, if there is better way to do this, please let me know.
Code:
#!/bin/bash
awk -F'/' '
$2==8 { print $1 " 255.0.0.0" }
$2==16 { print $1 " 255.255.0.0" }
$2==24 { print $1 " 255.255.255.0" }
' net.txt > net-mask.txt
Last edited by junior-helper; 12-05-2014 at 01:20 AM.. Reason: grammar
This User Gave Thanks to junior-helper For This Post:
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