Linux Bash re-picked 2016-8-16

Quotes supported by bash:

"" Double quotation mark: Weak reference, you can implement variable substitution (the variable will be replaced with a value)

SSH Echo " Directory is $ ((pwd)) "  0

' Single quote: Strong reference, do not complete variable substitution (what you input will output)

SSH Echo ' Directory is $ ((pwd)) ' Directory is $ ((pwd))

File name wildcard:

* Any length matching

？ Match only one character

[] matches any single character within the specified range

[^] Take the inverse match ls [^0-9]

i/p Redirect:

> Overwrite Output

ls /tmp/>/tmp/cat /tmp/ssh-6xolw4llamwesystemd-private- 30HjJisystemd-private-ch9s6xsystemd-private-mnh52bvarrryum_save_tx. -16.09-Geneva. K8wko4.yumtx

>> Append Output

[Email protected] ~]# ll/tmp/>>/tmp/Chen[[email protected]~]#Cat/tmp/Chen Total dosage --rw-r--r--.1Root root0August -  -: Onechendrwx------.2Chen Chen atAugust -  the:xx SSH-6xolw4llamwedrwx------.3Root root -August -  the:xxsystemd-private-30HjJidrwx------.3Root root -August -  the:xxsystemd-private-ch9s6xdrwx------.3Root root -August -  the:xxsystemd-private-mnh52b-rw-r--r--.1Root root139August -  -:TenVara-rw-r--r--.1Root root134August -  -: thevarrr-RW-------.1Root root602344August -  the: GenevaYum_save_tx. .- ,-16.09- Geneva. K8wko4.yumtx

(2> overwrite error output 2>> append error Output)

&> redirect standard output or error output to the same file, whether executed correctly or not

[Email protected] tmp]#ls/tmp/&>/tmp/Ccc1[[email protected] tmp]#Cat/tmp/ccc1 ccc1SSH-6xolw4llamwesystemd-private-30HjJisystemd-private-ch9s6xsystemd-private-Mnh52byum_save_tx. .- ,-16.09- Geneva. K8wko4.yumtx[[email protected] tmp]#ls/TMPPPP &>/tmp/Ccc2[[email protected] tmp]#Cat/tmp/CCC2ls: Unable to access/TMPPPP: No file or directory

< input redirection

<< Create a document here

Cat << END

Cat << EOF

Pipeline: |

Linux Bash re-picked 2016-8-16