Add text before and after matched string on the same line.


 
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# 1  
Old 03-02-2020
Add text before and after matched string on the same line.

I have a file with many lines. Below I'm highlighting only those line that concerns me from the file.
Code:
....
drwxr-xr-x    4 user1   dba           20480 Feb 25 20:38 /tmp/10203/cust/01
....
drwxr-xr-x    4 user1   dba           20480 Feb 25 20:38 /tmp/10203/cust/01/logs/mtr
....
drwxr-xr-x    4 user1   dba           20480 Feb 25 20:38 /tmp/10203/cust/03/src/files
drwxr-xr-x    4 user1   dba           20480 Feb 25 20:38 /tmp/10203/cust
....

I requirement is to append this string <font color=yellow> and add this string </font> at the end of the found string on the same line.

Thus, if we consider "/tmp/10203/cust/01" the desired output should be changes to the line with the exact match.
<font color=yellow>drwxr-xr-x 4 user1 dba 20480 Feb 25 20:38 /tmp/10203/cust/01</font>

It should not affect the superset string like this one "drwxr-xr-x 4 user1 dba 20480 Feb 25 20:38 /tmp/10203/cust/01/logs/mtr"

I know how to add text before and after the matched string on new line but i do not know how to on the same line with the exact match.

Below is what i tried:

Code:
sed 's/\b\/tmp\/10203\/cust\/01\b/& <\/font>' filename

But it adds the text to a superset string i.e does not exact match.

Can you please suggest ?
# 2  
Old 03-02-2020
Try
Code:
awk -v"PRFX=<font color=yellow>" -v"SUFX=</font>" '{sub ("^.*/tmp/10203/cust/01$", PRFX "&" SUFX)} 1' file
....
<font color=yellow>drwxr-xr-x    4 user1   dba           20480 Feb 25 20:38 /tmp/10203/cust/01</font>
....
drwxr-xr-x    4 user1   dba           20480 Feb 25 20:38 /tmp/10203/cust/01/logs/mtr
....
drwxr-xr-x    4 user1   dba           20480 Feb 25 20:38 /tmp/10203/cust/03/src/files
drwxr-xr-x    4 user1   dba           20480 Feb 25 20:38 /tmp/10203/cust
 ....




EDIT: ... and your approach, adapted:

Code:
sed 's/^.*\/tmp\/10203\/cust\/01$/<font color=yellow>&<\/font>/' file

# 3  
Old 03-02-2020
The problem I face is that the match pattern comes from a variable thus using escape charecters becomes difficult and i get the below error:

Code:
sed 's/^.*/tmp/10203/cust/01$/<font color=yellow>&</font>/'  /app/test.html 
sed: -e expression #1, char 20: unknown option to `s'

Is it possible to overcome this ?
# 4  
Old 03-02-2020
That was not mentioned in your specification. How about supplying a decent, complete problem description from the start?


Did you test the awk proposal? How far did it get you? With patterns supplied in variables?


As to your sed question: a simple look into the resp. documentation helps: info sed:


Quote:
3.3 The 's' Command
===================

The 's' command (as in substitute) is probably the most important in
'sed'

.
.
.
The '/' characters may be uniformly replaced by any other single
character within any given 's' command. ...
So - try e.g.
Code:
sed 's#^.*/tmp/10203/cust/01$#<font color=yellow>&</font>#' file

EDIT: or, in the variables' case,

Code:
$ PRFX='<font color=yellow>'
$ SUFX='</font>'
$ sed "s#^.*/tmp/10203/cust/01\$#${PRFX}&${SUFX}#" file

Be aware that with double quotes, you will / may need to escape "sed / regex special characters" like the $ sign, or others.

Last edited by RudiC; 03-02-2020 at 09:06 AM..
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