Finding an exact match in QNX without using grep -w

I’m writing a script that needs to find an exact match in a file that is compatible with QNX and POSIX compliant Linux

more detail:

Im trying to find the user of a process so the original command I wrote was

user=$(ps -aux | awk '{print $1 " " $2}' | grep -w ${process} | awk '{}print $1')

which works perfectly in POSIX compliant Linux

however, QNX isn’t totally POSIX compliant and grep -w isn’t usable for my target…so I need to find an exact match without grep -w

Answer

I think you want to print field 1 if field 2 exactly matches something:

ps -aux | awk -v p=$process '$2==p{print $1}'