bash - 在不知情的情况下从文件中删除扩展名

Question

我知道如何删除文件的扩展名，当我知道它是:

nameis=$(basename $dataset .csv)

但我想在事先不知道的情况下删除任何扩展程序，有人知道该怎么做吗？

感谢任何帮助，泰德

Answer 1

在 bash 中，您可以执行以下操作:

nameis=${dataset%.*}

...例如:

$ dataset=foo.txt
$ nameis=${dataset%.*}
$ echo $nameis
foo

此语法在 bash 手册页中描述为:

${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 positional 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.