Parametererweiterung in bash
bash
In diesem Fall können Sie die Parametererweiterung in verwenden
${parameter%word}
wo word
ist/*
${parameter##word}
wo word
ist*/
Beispiele:
Entfernen Sie den letzten Teil
$ asdf="xxx/xxxx/xxxxx/yyy"
$ echo ${asdf%/*}
xxx/xxxx/xxxxx
Dies ist beschrieben in man bash
:
${parameter%word}
${parameter%%word}
Remove matching suffix pattern. The word is expanded to produce
a pattern just as in pathname expansion. If the pattern matches
a trailing portion of the expanded value of parameter, then the
result of the expansion is the expanded value of parameter with
the shortest matching pattern (the ``%'' case) or the longest
matching pattern (the ``%%'' case) deleted. If parameter is @
or *, the pattern removal operation is applied to each posi‐
tional parameter in turn, and the expansion is the resultant
list. If parameter is an array variable subscripted with @ or
*, the pattern removal operation is applied to each member of
the array in turn, and the expansion is the resultant list.
Entfernen Sie alle außer dem letzten Teil
$ asdf="xxx/xxxx/xxxxx/yyy"
$ echo ${asdf##*/}
yyy
Sie können einen Schrägstrich wie diesen hinzufügen
$ echo /${asdf##*/}
/yyy
um genau das zu bekommen, was Sie an einer bestimmten Instanz gemäß der bearbeiteten Frage wollten. Aber die Frage wurde danach von mehreren Personen bearbeitet und es ist nicht einfach zu wissen, was Sie jetzt wollen.
Dies ist beschrieben in man bash
:
${parameter#word}
${parameter##word}
Remove matching prefix pattern. The word is expanded to produce
a pattern just as in pathname expansion. If the pattern matches
the beginning of the value of parameter, then the result of the
expansion is the expanded value of parameter with the shortest
matching pattern (the ``#'' case) or the longest matching pat‐
tern (the ``##'' case) deleted. If parameter is @ or *, the
pattern removal operation is applied to each positional parame‐
ter in turn, and the expansion is the resultant list. If param‐
eter is an array variable subscripted with @ or *, the pattern
removal operation is applied to each member of the array in
turn, and the expansion is the resultant list.