How to write a space with sed?

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How to write a space with sed?

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10-12-2016

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How to write a space with sed?

Hi,

I wish insert a line into a file, I created it with :

Code:

#--------------------------------------------------------------
# The loopback network interface
#--------------------------------------------------------------

auto lo
iface lo inet loopback

#--------------------------------------------------------------
# Eth0
#--------------------------------------------------------------
auto eth0
iface eth0 inet static

Then, I have inserted my line where I wanted with this command :

Code:

 
sed -i 13i' address 192.168.1.96' choice_interfaces.txt

It works but it doesn't respect the space at the beginning of the line before " address" How can I do?

Thanks in advance

Arnaudh78

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10-12-2016

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Try :

Code:

sed -i '13i\
 address 192.168.1.96
' infile3596

or

Code:

sed -i '13s/^/ address 192.168.1.96\
/' infile

with GNU sed:

Code:

sed -i '12s/^/ address 192.168.1.96\n/' infile

Last edited by Scrutinizer; 10-12-2016 at 05:23 PM..

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10-12-2016

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in case of perl,

Code:

perl -pe 's/^/ Address XYZ\n/ if ( $. == 13)' file

Here i am trying to insert a string " Address XYZ\n" so existing line/string are moved to next line.

Scrutinizer sed soultion or above perl solution will not give desired output if line13 does not exist

Seems Scrutinizer added two other solutions later and one of them is similar to perl solution

Last edited by greet_sed; 10-12-2016 at 05:39 PM.. Reason: add text

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10-12-2016

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Quote:

Originally Posted by Scrutinizer

Try :

Code:

sed -i '13i\
 address 192.168.1.96
' infile3596

or

Code:

sed -i '13s/^/ address 192.168.1.96\
/' infile

with GNU sed:

Code:

sed -i '12s/^/ address 192.168.1.96\n/' infile

Thanks it works

But it's right that if the line 13 doesn't exist its not working

Arnaudh78

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@ Scruntizer:

IMHO, it has to be

Code:

 sed -i '12s/$/\n address 192.168.1.96/' file

instead of

Code:

 sed -i '12s/^/ address 192.168.1.96\n/' file

Last edited by greet_sed; 10-12-2016 at 05:44 PM.. Reason: Add Code tags

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Quote:

Originally Posted by greet_sed

@ Scruntizer:

IMHO, it has to be

Code:

 sed -i '12s/$/\n address 192.168.1.96/' file

instead of

Code:

 sed -i '12s/^/ address 192.168.1.96\n/' file

Great ! many thanks

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10-13-2016

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i (insert) does not work on the last line.
a (append) works even on the last line. It must be a multi-line in order to work with all sed versions.

Code:

sed '12a\
 address 192.168.1.96/' choice_interfaces.txt

Instead of a number you could have a contents search

Code:

sed '/^iface eth0 inet static/a\
 address 192.168.1.96/' choice_interfaces.txt

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