How to realize the regular expression of path interception by shell in linux

Editor to share with you how to achieve path interception of regular expressions in shell in linux. I hope you will get something after reading this article. Let's discuss it together.

File=/dir1/dir2/dir3/my.file.txt

We can replace it with ${} to get different values:

${file#*/}: remove the first / and the string to the left: dir1/dir2/dir3/my.file.txt

${file##*/}: remove the last / and the string to the left: my.file.txt

${file#*.}: take off the first one. And the string to the left: file.txt

${file##*.}: remove the last one. And the string to the left: txt

${file%/*}: remove the last line / and the string to the right: / dir1/dir2/dir3

${file%%/*}: remove the first / and the string to the right: (null)

${file%.*}: remove the last one. And the string to the right: / dir1/dir2/dir3/my.file

${file%%.*}: take off the first one. And the string to the right: / dir1/dir2/dir3/my

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