Re^2: Localized STDIO and system()

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Re^3: Localized STDIO and system() by ikegami (Patriarch) on Jan 30, 2009 at 20:05 UTC
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 [download] 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.	[reply] [d/l] [select]

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Re^3: Localized STDIO and system()
by ikegami (Patriarch) on Jan 30, 2009 at 20:05 UTC

$ 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.

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