{"id":94,"date":"2011-09-10T17:25:39","date_gmt":"2011-09-10T11:55:39","guid":{"rendered":"http:\/\/askadmin.com\/?p=94"},"modified":"2015-04-07T14:25:49","modified_gmt":"2015-04-07T08:55:49","slug":"all-about-my-bash","status":"publish","type":"post","link":"https:\/\/askadmin.com\/aa\/all-about-my-bash\/","title":{"rendered":"# All About My bash #"},"content":{"rendered":"

I am not a linux guru ! . But\u00a0 in my work ,\u00a0 I do say hello\u00a0 at least once everyday \u00a0to my Linux servers\u00a0 from bash<\/em> .<\/p>\n

Bash is a unix\/linux command shell to execute commands . You can find different command shells like\u00a0tcsh,sh,zsh,bash\u00a0<\/em><\/span>in\u00a0bin<\/em>\u00a0<\/span>directoryetc.,\u00a0. \u00a0But my favourite&default command shell on our servers is ‘BASH<\/span>‘ .<\/p>\n

Controlling\u00a0bash seems interesting to me .<\/p>\n

Typing the command history<\/em><\/span> will display all the commands used previously on the system.<\/p>\n

I exported commands to a file this way..<\/p>\n

[root@c6 ~]#<\/strong> history > history.txt<\/em><\/span><\/p>\n

you will find a file called \u00a0.bashrc<\/span><\/em> in each user’s \u00a0home\u00a0directory\u00a0.<\/p>\n

\u00a0I edited my .bashrc file\u00a0<\/em><\/p>\n

[root@cf \/]#<\/strong> vi ~\/.bashrc<\/span><\/p>\n

and\u00a0added\u00a0below lines<\/p>\n

export HISTSIZE=10000<\/span><\/em> \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0( history will remember 10000 commands)\u00a0<\/span><\/p>\n

export HISTCONTROL=erasedups<\/span><\/em>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ( this will erase duplicated commands and keep only one copy of each comamnd )<\/p>\n

shopt -s histappend\u00a0<\/span><\/em>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 (this line says that commands not to be overwritten but appended)\u00a0<\/span><\/p>\n

Ok.. alright.. , Now what If \u00a0I dont like to save the command history ? .I will just use one of the methods below.<\/p>\n

method 1#<\/p>\n

To clear bash history when i am on terminal \u00a0, i use the command history -c\u00a0<\/em><\/span><\/p>\n

[root@cf \/]#<\/strong> history -c<\/em><\/span><\/p>\n

This will clear entire bash history whereas\u00a0history -r<\/em><\/span> command will clear the current session history only.<\/span>\u00a0<\/span><\/p>\n

[root@cf \/]#<\/strong> history -r<\/span><\/em><\/p>\n

method 2#<\/p>\n

clear bash history when logout the session<\/p>\n

edit .bash_logout \u00a0 file which we can find in every user home directory.<\/p>\n

[root@cf ~]#<\/strong> vi ~\/.bash_logout<\/em> \u00a0 \u00a0press i<\/span> \u00a0to insert below lines in vim editor<\/span><\/span><\/p>\n

\u00a0>~\/.bash_history<\/span><\/em><\/p>\n

sync;<\/span><\/em><\/p>\n

press escape and \u00a0type \u00a0:wq<\/span> \u00a0 and press enter \u00a0to save the changes in vim editor.<\/p>\n

This method will not \u00a0clear the history if you close the window without\u00a0logging out\u00a0from the terminal by using the command logout<\/span><\/em><\/p>\n

method 3 #<\/p>\n

The command \u00a0ln -sf \/dev\/null ~\/.bash_history<\/span> \u00a0will tell bash to send \u00a0history of commands to null, so it will not remember any commands that are typed in.<\/p>\n

\u00a0[root@cf ~]#<\/strong> ln -sf \/dev\/null ~\/.bash_history<\/em><\/span>\u00a0<\/span><\/p>\n

And finally .. one thing I passionate about is ,receiving \u00a0bashhistory to my mail automatically . I will write it in my next post .<\/p>\n","protected":false},"excerpt":{"rendered":"

I am not a linux guru ! . But\u00a0 in my work ,\u00a0 I do say hello\u00a0 at least once everyday \u00a0to my Linux servers\u00a0 from bash . Bash is a unix\/linux command shell to execute commands . You can find different command shells like\u00a0tcsh,sh,zsh,bash\u00a0in\u00a0bin\u00a0directoryetc.,\u00a0. \u00a0But my favourite&default command shell […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[7],"tags":[16,20,17,15,21,19,18],"yoast_head":"\nremove command history linux<\/title>\n<meta name=\"description\" content=\"remove command history linux\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/askadmin.com\/aa\/all-about-my-bash\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"remove command history linux\" \/>\n<meta property=\"og:description\" content=\"remove command history linux\" \/>\n<meta property=\"og:url\" content=\"https:\/\/askadmin.com\/aa\/all-about-my-bash\/\" \/>\n<meta property=\"og:site_name\" content=\"Ask Admin - 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