No, because special character weren't used. 
$ perl -e'print `ps -f`'
UID        PID  PPID  C STIME TTY          TIME CMD
eric     19557 19556  0 14:46 pts/4    00:00:00 /bin/bash
eric     19860 19557  0 15:05 pts/4    00:00:00 perl -eprint `ps -f`
eric     19861 19860  0 15:05 pts/4    00:00:00 ps -f

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Notice ps's PPID is perl's PID?

True, readpipe (backticks) can invoke the shell. Then again, so can system. IPC::System::Simple provides alternatives to system and readpipe that are guaranteed to avoid the shell.

In reply to Re^3: Localized STDIO and system() by ikegami
in thread Localized STDIO and system() by mill1359

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