Shell Programming and Scripting

Something like this??

Code:

$ cat script.sh
#!/usr/bin/env bash

number=99
awk -v line=2 -v col=1 -v var=$number '{ if(NR==line) { $col=var}; print $0}' text.txt
$ bash script.sh
10 200
99 600 1000
4 88 9
3
6 66 101

Regards,
Birei

@Birei

It works now. Thanks a lot.

If I have a long command how can I break that in a text editor (e.g. I've been using vi editor) so that scripting instruction is obeyed ?

Like I want to write
awk -v line=2 -v col=1 -v var=$number <break>

'{ if(NR==line) { $col=var}; print $0}' test.txt

Try:

Code:

awk -v line=2 -v col=1 -v var=$number \
        '{ if(NR==line) { $col=var }; print $0}' test.txt

Regards,
Birei

Code:

line=2
col=1
var=99
awk -v line=$line -v col=$col -v var=$var 'NR==line{$col=var}1' file

@birei

This is a bit strange.

When I copied your lines and pasted and then ran the shell script,it worked fine.

But if I type them line-wise, it shows error.

However, if I write the whole command together and create the second line by pressing Enter key, it works again!

I did it in vi editor. I wondered how the way of writing (pressing enter to make a new line or write as a fresh on the next line) makes difference.