grep question using backslash

I have the following file:

asdasd
asd
asd
incompatible:svcnotallowed:svc\:/network/bmb/clerver\:default
incompatible:svcnotallowed:svc\:/network1/bmb/clerver\:default
incompatible:svcnotallowed:svc\:/network2/bmb/clerver\:default
asdasd
asd
asd
as

And now suppose I have the two variables v1="incompatible:svcnotallowed:" and v2="svc\:/network1/bmb/clerver\:default". I would like to search the entire file using v1 and v2. I know this is a problem caused due to the file having a'\' in it. I just dont know how to eliminate it. I have tried storing v1 and v2 (both var开发者_高级运维iable contents and grep usage) using single quotes, but in vain.

This is the series of commands I have tried :

grep "$v1$v2" file
grep '$v1$v2' file

I need this to work in KSH please let me know the right way to use grep in this scenario. Thanks.

grep -F "$v1$v2" file should do the trick -- with the -F option, it treats the pattern as a fixed string, so backslashes don't get interpreted as escapes or backreferences.

But fgrep "$v1$v2" file would probably be the most portable solution. As tomkaith13 notes in his comment, the -F option to grep isn't universally supported. On Solaris, the default grep doesn't support -F, but the version in /usr/xpg4/bin does.

Since you are using ksh, you can just use it to read the files

v1="incompatible:svcnotallowed:"
v2="svc\:/network1/bmb/clerver\:default"
while read -r line
do
    case "$line" in
        "$v1$v2" ) echo "$line";;
    esac
done < file