history Linux Command

What is Linux history Command?

Explanation

history command is used to list out the recently executed commands in the number line order.

history [-c] [-d offset ] [ n ]
history -anrw [ filename ]
history -ps arg [ arg... ]

Options	Description
-a	Attaches history lines with the history page from this session.
-n	Read the unread messages from the history lines.
-r	Attaches all the content to the history list after reading the history files.
-d offset	delete the history entry at offset OFFSET.
-c	Clears the complete history list.
-w	Attaches the current history from the current file to the history list.
-p	Expands history in each arg and shows the output without storing it in the history list.
-s	Attaches the arg with the history list and stores as single list.

To list the recently executed commands:
history

Output
121ping google.com
122ping 192.168.0.1
123ping google.com
124ping 192.168.0.1
125cd /home/ganesh/Documents/backup/local/
126mv Make_words/ /opt/lampp/htdocs/android/
127mv firstapp/ /opt/lampp/htdocs/android/
128whereis JDK
129whereis java
130java -version
131whereis java

This command is used to list the history .
To find specific command in history list:
history | grep cd

Output
33 cd Pictures/
37 cd ..
39 cd Desktop/
61 cd /usr/bin/
68 cd
83 cd /etc/
86 cd resolvconf/
90 cd resolv.conf.d/

This command is used to list only cd commands from history list.
To copy history list to file:
history -a history.txt

Output
In history.txt file.
3 121ping google.com
122ping 192.168.0.1
123ping google.com
124ping 192.168.0.1
125cd /home/ganesh/Documents/backup/local/
126mv Make_words/ /opt/lampp/htdocs/android/
127mv firstapp/ /opt/lampp/htdocs/android/
128whereis JDK
129whereis java
130java -version
131whereis java

This command is used to copy history list to history.txt file .
To Clear all history:
history -c

This command can be used to clear all history from history list.

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