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Add to the second line of the file first character

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# 1  
Old 06-24-2018
Add to the second line of the file first character
I have a file:
Code:
H,20180620093911,VPAS,TRANSHDR,20180620,VPAS.TRANS_HDR.20170731.01.txt,
 ,876,496737dd53431ef666cad1a3511b3c5a8912f505bf6edfb9d0e225fb049ce934,
T,1,


I need to add to the second line

I have a command sed, how can I find the second line?


Thanks for contribution
# 2  
Old 06-24-2018
For example to replace the first character on line 2 with an "X", try:
Code:
sed '2s/^./X/' file

Code:
H,20180620093911,VPAS,TRANSHDR,20180620,VPAS.TRANS_HDR.20170731.01.txt,
X,876,496737dd53431ef666cad1a3511b3c5a8912f505bf6edfb9d0e225fb049ce934,
T,1,

To insert a character "X" before the 2nd line:
Code:
sed '2s/^/X/' file

Code:
H,20180620093911,VPAS,TRANSHDR,20180620,VPAS.TRANS_HDR.20170731.01.txt,
X ,876,496737dd53431ef666cad1a3511b3c5a8912f505bf6edfb9d0e225fb049ce934,
T,1,

# 3  
Old 06-24-2018
Quote:
Originally Posted by Scrutinizer
For example to replace the first character on line 2 with an "X", try:
Code:
sed '2s/^./X/' file

Code:
H,20180620093911,VPAS,TRANSHDR,20180620,VPAS.TRANS_HDR.20170731.01.txt,
X,876,496737dd53431ef666cad1a3511b3c5a8912f505bf6edfb9d0e225fb049ce934,
T,1,

To insert a character "X" before the 2nd line:
Code:
sed '2s/^/X/' file

Code:
H,20180620093911,VPAS,TRANSHDR,20180620,VPAS.TRANS_HDR.20170731.01.txt,
X ,876,496737dd53431ef666cad1a3511b3c5a8912f505bf6edfb9d0e225fb049ce934,
T,1,




I insert variable:
Code:
cnt=`wc -l $CONTROLFILE | awk '{print $1}'`
sed '2s/^/$cnt/' $CONTROLFILE


And no result.
Please advise


Thanks for contribution

---------- Post updated at 05:04 PM ---------- Previous update was at 04:57 PM ----------

Quote:
Originally Posted by digioleg54
I insert variable:
Code:
cnt=`wc -l $CONTROLFILE | awk '{print $1}'`
sed '2s/^/$cnt/' $CONTROLFILE

And no result.
Please advise







Thanks for contribution

Even I put:
Code:
sed '2s/^./3/' $CONTROLFILE


Anyway no result:
Code:
H,20180624170202,VPAS,TRANS_HDR,20180724,VPAS.TRANS_HDR.20180724.01.txt,
 ,93,
T,1,




I don't know what to do with it.


Thanks
# 4  
Old 06-24-2018
Shell variables are not expanded when they appear in a command line between single quotes. Try changing the single quotes in the sed command first argument:
Code:
cnt=`wc -l $CONTROLFILE | awk '{print $1}'`
sed '2s/^/$cnt/' $CONTROLFILE

to double quotes:
Code:
cnt=`wc -l $CONTROLFILE | awk '{print $1}'`
sed "2s/^/$cnt/" $CONTROLFILE

# 5  
Old 06-25-2018
What do you mean by

Quote:
Originally Posted by digioleg54
. . .
Anyway no result:
Code:
H,20180624170202,VPAS,TRANS_HDR,20180724,VPAS.TRANS_HDR.20180724.01.txt,
 ,93,
T,1,

. . .

Is this the command's output or the file's contents after the command?
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