Extracting directory name, filename and extension from the Shell script extraction path in Linux

When writing a script (Shell), you will often encounter the path name, file name, and so on in the filename including the full path.

This includes a full path file named

/usr/local/apach2/etc/httpd.conf

Defined as

File= "/usr/local/apach2/etc/httpd.conf"

(1) Extract filename

filename=${file##*/}

##*/represents the deletion from the front to the last/appearing part, so filename is httpd.conf.

(2) Extract the file name extension

ext=${file##*.}

As with (1), delete from the front to the last. Section, ext for CONF.

(3) Extraction of httpd

withoutext=${file%.*}

%.* deletes from the last start to the 1th time. The part of the without is/usr/local/apach2/etc/httpd.

(4) Extract directory name

dirname=${file%/*}

%/* deletes from the last start to the 1th occurrence/part, dirname for/USR/LOCAL/APACH2/ETC.

# #和 percent represents the longest consistent, while # and% indicate the shortest consistent. #表示从前面,% expressed from behind.

Here is a sample script

/tr>

code is as follows	copy code
#!/bin/ Bash file= "/usr/local/apach2/etc/httpd.conf" filename=${file##*/} ext=${file##*.} withoutext=${file%.*} dirname=${file%/*} Echo $FILENAME Echo $EXT Echo $WITHOUTEXT Echo $ DirName Execution results are httpd.conf conf /usr/local/apach2/etc/httpd /usr/local/apach2/etc