UNIX for Dummies Questions & Answers

Hello

I have a simple code like this one:

Code:

#!/bin/ksh
VER=$1
cat /usr/text | while read line
 do
  echo $line 
 done

Let's say $1=1.0.0 and the contents of text is:
abcd.cfg
asdf
I would like the output to be like this
abcd1.0.0.cfg
asdf1.0.0
I am thinking of passing the value of the parameter to the text file. But i dont know if it is possible.

Code:

X=${1:-1.0.0}
while IFS=. read NAME EXT; do
  echo $NAME$X.$EXT
done < file

I'd rather edit with sed:

Code:

 
sed '
  s/\.cfg$/'"$1"'/
  t
  s/$/'"$1"'/
 ' /usr/text

However, you can ksh-substring your variables like line: ${line#*.} is everything after the first dot, ${line##*.} is everything after the last dot, ${line%%.*} is everything before the first dot. My mnemonic is # is pound soft on the nose, %% is get a big percent in the end. The wild card metacharacters are shell file-glob like case, not regex as used in grep and sed.

Both method works.
Thanks!

I have a question regarding DGPickett's suggestion. How do i use that method if i have a text file which doesnt have a "." on it? So if the script encountered a line like that it will just append the number.

By the way, i used the ${line#*.} , ${line%%.*} method.

I don't think either solution worked, actually

Here's a fix for the sed one (which forgot to put the extension back on when there was a "dot"):

Code:

sed '
  s/\.cfg$/'"$1"'&/
  t
  s/$/'"$1"'/
 ' file

And for the shell one (which left a trailing "dot" when there was no extension):

Code:

X=${1:-1.0.0}
while IFS=. read NAME EXT; do
  echo $NAME$X${EXT:+.$EXT}
done < file

thanks for all the help guys finally got my script working.