Shell Programming and Scripting

HI experts....

i need to know if there is a way of appending some text to an existing string using "tr" command....i know it can be done easily using awk and sed....


but i need to know if there is way we can do that using tr command

so

the output is in the format

somename
xname
zname

i want to output in the format

somename, a
xname, a
zname, a

so i just want to append ",a" to an existing string

I have to do this only using tr command please advice.

thanks

You would/could probably never do what you describe with tr. tr works on a per character basis, not a group of characters (a string). Plus tr means translate, that means:
'change one character to another' So, tr works one just one single character at a time, not two.

ways to do what you ask

Code:

# one way
while read rec
do
   echo "$rec" ", a"
done < inputfile > outputfile
# another way
awk '{print $0 ", a" } ' inputfile > outputfile
# sed
sed 's/[a-zA-z0-9 ]$/&, a/'  inputfile > outputfile

An in-place option:

Code:

printf '1,$s/$/, a/\nw\nq\n' | ed -s data

Code:

# ./justdoit
somename,a
xname,a
zname,a

Code:

 
for myval in `cat infile`
  do
   echo $(printf "$(echo "$myval")\na"|tr '\n' ',') >> mytemp
  done
more mytemp

Could work, but it's not the most efficient way