Linux: Command Execution Control & |

1 ,&&

Mode: command1 & command2

If command1 is successfully executed, execute command2

-RW-r -- 1 Kevin 0 September 11 00:55 1.log

[kevin@kevin test]$ ll

Total usage 4

-RW-r -- 1 Kevin 0 September 11 00:55 1.log

[kevin@kevin test]$ mv 1.log tmp.log && ls -l

Total usage 4

-RW-r -- 1 Kevin 0 September 11 00:55 TMP. Log

[kevin@kevin test]$ 

[kevin@kevin test]$ cat 1.log && ls -l

Cat: 1.log: the file or directory does not exist.

[kevin@kevin test]$ 

2. |

Mode: command1 | command2

If command1 fails, execute command2

[kevin@kevin test]$ cat 1.log || ls -l

Cat: 1.log: the file or directory does not exist.

Total usage 4

-RW-r -- 1 Kevin 0 September 11 00:55 TMP. Log

[kevin@kevin test]$ cat tmp.log || ls -l

[kevin@kevin test]$