linux 在shell脚本中获取该脚本的所在绝对路径
脚本名：a.sh位置：/tmp/whuang/study/java
脚本内容：
#!/bin/shthis_dir=`pwd`dirname $0|grep "^/" >/dev/nullif [ $? -eq 0 ];then this_dir=`dirname $0`else dirname $0|grep "^\." >/dev/null retval=$? if [ $retval -eq 0 ];then this_dir=`dirname $0|sed "s#^.#$this_dir#"` else this_dir=`dirname $0|sed "s#^#$this_dir/#"` fifiecho $this_dir
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