August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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15.2. Ustawianie zmiennej $PATH zgodnie z zaleceniami POSIX
Problem
Pracujemy w systemie, który udostępnia starsze narzędzia lub narzędzia określonego dostawcy (np. Solaris) i musimy wyznaczyć wartość zmiennej $PATH w taki sposób, aby była ona zgodna ze specyfikacją POSIX.
Rozwiązanie
Wystarczy wykorzystać narzędzie getconf.
PATH=$(PATH=/bin:/usr/bin getconf PATH)
Poniżej zostało przedstawionych kilka domyślnych wartości zmiennej $PATH oraz wartości generowanych przez polecenie getconf (zgodnych z zaleceniami POSIX) w różnych systemach operacyjnych:
# Red Hat Enterprise Linux (RHEL) 4.3 $ echo $PATH /usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/home/$USER/bin $ getconf PATH /bin:/usr/bin # Debian Sarge $ echo $PATH /usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.