Add character to specific columns using sed or awk and make it a permanent change


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# 8  
I know this doesn't work, my question is how to do the, if not, THEN in sed? I guess I use the branching but had less than success with it, anyway let me know.
Code:
sed -n 'p;/{/ !s/^/#/; s/^\(.*\)/# \1/' file6

If not
Code:
{

then add
Code:
#

with the other sustitute statement. Thanks

P.S. Simply put, If I am too confusing maybe show me how to do this particular example with sed, the original question.
# 9  
Quote:
Originally Posted by Klasform
I know this doesn't work, my question is how to do the, if not, THEN in sed? I guess I use the branching but had less than success with it, anyway let me know.
Code:
sed -n 'p;/{/ !s/^/#/; s/^\(.*\)/# \1/' file6

If not
Code:
{

then add
Code:
#

with the other sustitute statement. Thanks

P.S. Simply put, If I am too confusing maybe show me how to do this particular example with sed, the original question.
That is not the original question. The original question was how to put an octothorps at the start of every line that contains the string beautiful. The obvious way to do that in sed is:
Code:
sed '/beautiful/s/^/#/' file

but the original request was also to put the results back in the input file. Just using standard sed features (i.e., no -i option), that can be done with:
Code:
sed '/beautiful/s/^/#/' file > file.$$ && cp file.$$ file;rm -f file.$$

But, if you did want to add an octothorpe to the lines that do NOT contain beautiful, you can do that in sed with:
Code:
sed '/beautiful/n;s/^/#/' file

# 10  
Sorry Don will ask the question as a new one,
thanks
# 11  
Code:
while read line
do
   echo "$line" |grep beautiful >/dev/null 2>&1
   if [ $? = 0 ]
   then
     echo "#$line"
   else
     echo "$line"
   fi
done <a.sh

If you want to write it using a script.
# 12  
Rudic can you explain !s
sed '/{/ !s/^/#/' file

Last edited by Don Cragun; 10-21-2015 at 05:47 AM.. Reason: Remove broken QUOTE tags.
# 13  
Quote:
Originally Posted by ashima jain
Rudic can you explain !s
sed '/{/ !s/^/#/' file
From the standards:
Quote:
A function can be preceded by one or more ! characters, in which case the function shall be applied if the addresses do not select the pattern space. Zero or more <blank> characters shall be accepted before the first ! character. It is unspecified whether <blank> characters can follow a ! character, and conforming applications shall not follow a ! character with <blank> characters.
Or, translated from standardese, perform the specified substitution (insert an octothorpe at the start of a line) on lines that do not contain an open brace character.
This User Gave Thanks to Don Cragun For This Post:
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