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Insert a string instead of blank lines

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# 1  
Old 05-08-2012
Insert a string instead of blank lines
how can i insert a string sush as "###" instead of blank lines in a file?
i try this code but it doesn't work!
Code:
awk 'NF<1 {$1=="###" ; print$0}' in_file > out_file

# 2  
Old 05-08-2012
Hi oreka18,

Do you mean substitute blank lines with '###'? One way:
Code:
$ perl -lpe 's/\A\s*\Z/###/' infile

# 3  
Old 05-08-2012
Use single = for assignment:
Code:
awk 'NF<1 {$1="###"}1'

# 4  
Old 05-08-2012
or
Code:
# awk '/^ *$/{$1="###"}1'

# 5  
Old 05-08-2012
reply
non of them doesn't work!!!Smilie
# 6  
Old 05-08-2012
What OS and version do you use?
On Solaris use /usr/xpg4/bin/awk rather than awk
Last edited by Scrutinizer; 05-08-2012 at 05:44 AM..
# 7  
Old 05-08-2012
use nawk instead of awk

---------- Post updated at 02:15 PM ---------- Previous update was at 02:12 PM ----------

Scrutinizer already asked the same question (what OS ?) in another thread

https://www.unix.com/shell-programmin...ld-word-2.html

so, always mention your OS and shell.
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