How can I replace the lines that start with a star and replace it with numbers start from 1?


 
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# 1  
Old 11-07-2014
how can I use sed to replace the lists that begins with (*) in a file

I need to replace the (*) in the fist of a list with numbers using sed for example >

this file contain a list

* linux

* computers

* labs

* questions

to >>>>

this file contain a list

1. linux
2. computers
3. labs
4. questions

I tried using

sed -e 's/*//' file.in > file.out | sed -i = file.out

Last edited by aalbazie; 11-07-2014 at 03:09 PM.. Reason: mistake
# 2  
Old 11-07-2014
You better escape the special character \*
sed is not the right tool for this. The = command is mainly for debugging.
Of course - everything is possible
Code:
sed = list | sed 'N;s/\n\*//'

awk or the shell's while loop do this better. With awk:
Code:
awk '{$1=NR; print}' list

Shell:
Code:
i=0; while read first other; do echo "$((i+=1)) $other"; done < list


Last edited by MadeInGermany; 11-07-2014 at 03:39 PM..
# 3  
Old 11-07-2014
Quote:
Originally Posted by MadeInGermany
You better escape the special character \*
sed is not the right tool for this. The = command is mainly for debugging.
Of course - everything is possible
Code:
sed = list | sed 'N;s/\n\*//'

awk or the shell's while loop do this better. With awk:
Code:
awk '{print NR,$2}' list

thank you for your replay this didn't work the file that I want to do this on is more than 400 lines and there are about 30 lines starts with star when I tried your code I did
sed = file.in > list.out | sed 'N;s/\n\*//' list.out
it id number all the lines in the file
# 4  
Old 11-07-2014
Please in your posts wrap your code in [code] tags!
This should also solve your new requirement; I have predicted your next requirement: reset the counter outside the * list.
Code:
awk '{if ($1=="*") {$1=++i} else {i=0}; print}' list

# 5  
Old 11-07-2014
How about:

Code:
C=1
NF=file_new.txt

[[ -f $NF ]] && rm -fr $NF
touch $NF

while read line;do
	[[ "*" = "${line:0:1}" ]] && \
		line="${line/\*/$C.}" && \
		C=$((C+1)) ||  \
		C=1
	echo "$line" >> $NF
done<file.txt

cat $NF

Hope this helps

Last edited by sea; 11-07-2014 at 03:55 PM.. Reason: Code update, a little smaller
# 6  
Old 11-10-2014
@sea: nothing speaks against
Code:
C=1
while read line; do
  ...
  echo "$line"
done <file.txt >file_new.txt

This User Gave Thanks to MadeInGermany For This Post:
# 7  
Old 11-10-2014
@ MadeinGermany: I'm not used to 'double' redirections as yours, wouldnt this overwrite the file_new.txt with just the 'most recent' (as in the current line-) output?
Or would i have to understand (technical incorrect i know) such a command (the behaviour) like cat?
 
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