I wanted to use SED to find and replace a small string of text within a number of files.
Specifically the substitution I want to perform is:
sed -e '/35=R/s/|131=.*|/|131=$UNIQUE|/g' $f
Which is running within a bash script where $f is the filename.
The sed searches for lines which contain the string 35=R and then has a very simple expression to replaces |131=.*| (anything after the |131=) with |131=$UNIQUE|.
This seems to work perfectly on some files however in other cases:
Eg working example:
Before:
8=FIX.4.2|9=151|35=R|56=ABC|142=7848|50=STUFF|49=OTHERSTUFF|52=20250905-06:00:10.910|34=107|146=1|55=DE123|22=4|48=DE123|38=1|54=1|207=F|131=12ABC|10=243
After:
8=FIX.4.2|9=151|35=R|56=COBA|142=7848|50=STUFF|49=OTHERSTUFF|52=20250905-06:00:10.910|34=107|146=1|55=DE123|22=4|48=DE123|38=1|54=1|207=F|131=$UNIQUE|10=243
However in other cases it seems to output with large blocks of text missing.
Example not working:
Before:
8=FIX.4.2|9=147|35=R|34=15301|49=STUFF|52=20190905-15:27:54.305|56=OTHERSTUFF|115=STUFFY|131=1234abc|146=1|55=AB123|15=ZYX|22=4|38=1|48=AB123|54=2|207=STUFF|10=253
After:
8=FIX.4.2|9=147|35=R|34=15301|49=STUFF|52=20190905-15:27:54.305|56=OTHERSTUFF|115=STUFFY|131=$UNIQUE|10=253
As you can see its missing everything following the pipe after 131=$UNIQUE. I'm fairly new to expressions and sed so its possible I'm misunderstanding the substitution part. Any pointers would be hugely appreciated.
Thank you.
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