Shell Programming and Scripting

hello,

i have a file "TEST" and want to change the digit(s) after "=" . but i also want to print the old entry with a comment (for information).
i want to use "sed", is it possible ?

file:
TEST = 10 # comment default value: 0

sed , with "p" , i can print the old entry, but i want to change it with "#"

sed -e "/^\([ \t]*TEST[ \t]*=[ \t]*\)/ {
p
s/^\([ \t]*TEST[ \t]*=[ \t]*\)\([0-9]*\)\([ \t]*\)/\199\3/p
}" TEST

the new output should be:
#TEST = 10 # comment default value: 0
TEST = 99 # comment default value: 0

regards

In case no sed solution is presented:

Code:

awk '/^TEST[ =]/ { print "#" $0; sub("[0-9]+",99); } { print; }'

With gawk/nawk/mawk you can pass in variables. For gawk:

Code:

gawk -v tomatch=TEST -v newval=99  \
'    /^[a-zA-Z]+[ =]/ { 
            if (match($0,"^" tomatch "[ =]")) { print "#" $0; sub("[0-9]+",newval); } 
     } 
     { print; }
'

hello,

thank's for your answer, i use "akw" because the main plattform is hpux and "gawk" is a an optional software product. i extend a litte bit your "awk" and this is now my solution:

Code:

new_value=99
awk -v newval=${new_value} ' BEGIN { FS = "[ \t]*|[ \t]+" }
 $0 ~ /^[ \t]*TEST[ \t]*/ {
  print "# Overriding: " $0; sub("[0-9]+",newval); }
  { print; }' TEST

greetings,tom