CentOS Linux Server Guide

Centos Linux Command Line Operation

Using "&&" symbol

In contrast with ";" symbol, you use this symbol to ensure both only first command is success then the system will only proceed with second command.

SYNOPSIS

command && command

In the following example, first we change to /demo, then we list the contents at /demo directory. Note: first command is valid then we proceed with second command.

cd /demo && ls -l
total 44
drwxr-xr-x 2 root root 4096 Nov 29 17:19 Dir_empty
-rw-r--r-- 1 root root 64 Nov 30 01:22 error.txt
-rw-r----- 1 root root 0 Nov 30 00:10 jane
drwxr-xr-x 2 root root 4096 Nov 28 16:00 myDir
drwxr-xr-x 2 root root 4096 Nov 28 15:43 newmyDir
-rw-r--r-- 1 root root 8 Nov 30 00:59 test.txt

In the following example, first, we change to /etc/passwd (which is file,NOT a directory), then we ls all the files and folders. Note: first command is fail, the system will stop processing second command and issue us with stderr (error output to screen)

cd /etc/passwd && ls -l
-bash: cd: /etc/passwd: Not a directory

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