awk question

[jls]

Hi Guys,

I am using a BASH script to add users to an ACL in the squid.conf file. Basically the script searches for a string and adds a variable to the end of the string like this:

cat /etc/squid/squid.conf | awk "/INTERNET/{ $0=$0 " $UNAME" } {print} " > /tmp/sq.conf
mv /tmp/sq.conf /etc/squid/squid.conf

Now the problem is that there is more than one occurrence of the search string (INTERNET in this case). I want awk to stop after the first successful operation.
At the moment it is adding the user to the ACL and again where it finds 'INTERNET' in the http_access directive.
Thanks

[ghostdog74]

just a concept, you can try add a flag

awk '/INTERNET/ && flag != 1{ "dosomething" ; flag=1 } {print }'

initially, flag is not equal 1, so it process the line and then sets the flag. For subsequent INTERNET patterns, because the flag is already 1, it will just print

[tpl]

hi jls,

thanks for an interesting question:
if the phrase is fixed, and short, try this:

sed 's/INTERNET/INTERNET '$UNAME'/;1q'

otherwise like this:

awk '/INTERNET/ {$0=$0 "$UNAME";print;exit}'

the flag idea would be needed for 2 or more

[jls]

Thanks guys.

sed is now my freind

[ghostdog74]

awk '/INTERNET/ {$0=$0 "$UNAME";print;exit}'

the flag idea would be needed for 2 or more

i had interpreted OP wants to change only the first line with INTERNET , then carry on with the rest of the input file, where other INTERNET lines are not changed. He is changing som e config file called "http_access" and if he only exits after the first operation, won't his config file contain only that line? anyway, since OP has solved the issue, i guess its no problem...cheers

[jls]

Or maybe not........Using the sed string deletes everything except the first line of the squid.conf file

Am now trying the awk with flag options but the problem is that the ' ' around awk masks the $.

So the string $UNAME is added instead of the variable. I tried substituting the ' 'with " " but that gives me this error:

wk: /INTERNET/ && flag != 1{ -bash=-bash
awk:                               ^ syntax error
awk: cmd. line:1: /INTERNET/ && flag != 1{ -bash=-bash
awk: cmd. line:1:                                      ^ unexpected newline or end of string

[ghostdog74]

why don't you post a sample of your squid file, then what you want your output to be. its better this way..