Shell Programming and Scripting

Hi,

i need to replace hyphen with underscore in a string and also append some text before it.

e.g. if the string is 130707-abc-123.txt then it has to be made UB130707_abc_123.txt.

Also, need help on how to do it on many strings exist in a file.

I know it can be done by using sed but it looks very discouraging to go through SED as it's syntax is very complex. If anybody knows any trick to get through of SED, please let me know.

Thanks

prvn

Code:

echo "130707-abc-123.txt" | sed 's/^/UB/' | tr '-' '_'

or

Code:

echo "130707-abc-123.txt" | sed "s/\([0-9]\{6\}\)-\([a-z]\{3\}\)-\(.*\)/UB\1_\2_\3/g"

Code:

echo "130707-abc-123.txt"|sed -e 's/^/UB/g' -e 's/-/_/g'

Great.. thanks to lorcan and ranj.

Lorcan, can you explain about your 2nd solution?

Also, can anybody give me how to proceed with SED to understand easily....?


Thanks

For basics you can start with SED Tutorial with examples

echo "130707-abc-123.txt"|sed -e 's/^/UB/g ;s/-/_/g'