August 2012
Intermediate to advanced
624 pages
17h 11m
Polish
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16.4. Chwilowa zmiana wartości $PATH
Problem
Chcemy mieć możliwość łatwego dodawania nowych katalogów do zmiennej $PATH lub ich usuwania, ale tylko w czasie trwania danej sesji.
Rozwiązanie
Istnieje kilka metod rozwiązania tego problemu.
Aby dołączyć nazwę katalogu na początku lub końcu ciągu zmiennej $PATH, wystarczy użyć instrukcji PATH="nowy_katalog:$PATH" lub PATH="$PATH:nowy_katalog". Najpierw trzeba się jednak upewnić, że katalog nie został wcześniej zapisany w ciągu $PATH.
Jeżeli konieczne jest wstawienie pewnej wartości w środku ciągu $PATH, można wyświetlić cały ciąg na ekranie za pomocą polecenia echo, a następnie, korzystając z funkcji „kopiuj i wklej” terminala, powielić ciąg w nowym wierszu i odpowiednio wyedytować. Można również zastosować ...
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