linux学习笔记:shell脚本编程相关(上)
$ ls1.shattachfile
$ [ -e "/home/guest/file" ] && echo "True" || echo "False"
True
$ [ -d "/home/guest/file" ] && echo "True" || echo "False"
False
$ [ -f "/home/guest/file" ] && echo "True" || echo "False"
True
$ ls -al
total 28
drwx------3 guest guest144 Apr 17 16:51 .
drwxr-xr-x. 3 rootroot 18 Mar 30 10:58 ..
-rwxr-xr-x1 guest guest171 Apr 17 16:51 1.sh
-rw-r--r--1 rootroot 1 Mar 30 13:21 attach
-rw-------1 guest guest416 Apr 10 17:05 .bash_history
-rw-r--r--1 guest guest 18 Nov 202015 .bash_logout
-rw-r--r--1 guest guest193 Nov 202015 .bash_profile
-rw-r--r--1 guest guest231 Nov 202015 .bashrc
--w-------1 guest guest 0 Apr 10 16:58 file
drwxr-xr-x4 guest guest 37 Mar 19 18:42 .mozilla
-rw-------1 guest guest 1013 Apr 17 16:51 .viminfo
$
$ [ -r "/home/guest/file" ] && echo "True" || echo "False"
False
$ [ -w "/home/guest/file" ] && echo "True" || echo "False"
True
$ [ -x "/home/guest/file" ] && echo "True" || echo "False"
False
......
......
$ [ "/home/guest/.bash_history" -nt "/home/guest/.bash_logout" ] && echo "True" || echo " False"
True
$ [ "/home/guest/.bash_history" -ot "/home/guest/.bash_logout" ] && echo "True" || echo " False"
False
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