rangerll的部落格

bash-3.2$ FILENAME=somefile.tar.gz      //指定黨名
bash-3.2$ echo ${FILENAME%%.*}          //設定抓取檔名(%%. 指:用.為分段來截斷最長的字串)
somefile
bash-3.2$ echo ${FILENAME%.*}           //設定抓取副檔名(%.指:用.為分段來截斷最短的字串)
somefile.tar

#!/bin/bash

FULL_PATH=/d/d1/F1/sh/runDIR.239.sh.ppw

echo "FULL_PATH=$FULL_PATH "
echo "%%.*=${FULL_PATH%%.*} "
echo "%.*FULL_PATH=${FULL_PATH%.*} "

echo " "
echo "##*.=${FULL_PATH##*.} "
echo "#*.=${FULL_PATH#*.} "

echo " "
echo "##*/=${FULL_PATH##*/} "
echo "#*/=${FULL_PATH#*/} "

[root@fopa01 dir]# ./dir.sh
FULL_PATH=/d/d1/F1/sh/runDIR.239.sh.ppw
%%.*=/d/d1/F1/sh/runDIR
%.*FULL_PATH=/d/d1/F1/sh/runDIR.239.sh

##*.=ppw
#*.=239.sh.ppw

##*/=runDIR.239.sh.ppw
#*/=d/d1/F1/sh/runDIR.239.sh.ppw

This site explains more.

${variable%pattern*}
Trim the shortest match from the end  (從結尾去除文字，直到遇見第一個相同的特徵)

${variable##pattern*}
Trim the longest match from the beginning  (從開頭去除文字，直到遇見最後相同的特徵)

 ${variable%%pattern*}
Trim the longest match from the end (從結尾去除文字，直到遇見最後相同的特徵)

 ${variable#pattern*}
Trim the shortest match from the beginning  (從開頭去除文字，直到遇見第一個相同的特徵)

[root@fopa01 sh]# basename /d/d1/123.txt           //去除資料夾路徑
123.txt
[root@fopa01 sh]# basename /d/d1/123.txt .txt   //去除資料夾路徑+去除指定副檔名
123