Redirection of output and input in unix/linux

Redirection of output and input in unix/linux

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  Created by
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  TopicsSHELL1Different types ofshell
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  Summary of shellfeatures
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  Configuration files forshellsREDIRECTION OF OUTPUT AND INPUT 2Redirect descriptor
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  Redirect usage12Different typesof shellShellPathDescriptionOSBourne/bin/shThis is the original Unix shell written by Steve Bourne of Bell Labs. It is available on all UNIX systems.All unixKorn/bin/kshThis shell was written by David Korn of Bell labs. It is now provided as the standard shell on Unix systems.AIXC/bin/cshThis shell was written at the University of California, Berkeley. It provides a C-like language with which to write shell script.BSDTC/bin/tcshThis shell is available in the public domain. It provides all the features of the C shell together with emacs style editing of the command line.MAC OSXBash/bin/bashThis is a public domain shell written by the Free Software Foundation under their GNU initiative.Ubuntu, CentosReference: http://unixhelp.ed.ac.uk/shell/oview2.html
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  TopicsSHELL1Different types ofshell
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  Summary of shellfeatures
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  Configuration files forshellsREDIRECTION OF OUTPUT AND INPUT 2Redirect descriptor
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  Redirect usage12Summary ofshell features BourneCTCKornBashCommand historynoyesyesyesyesCommand aliasnoyesyesyesyesShell scripts yesyesyesyesyesFilename completion noyes*yesyes*yesCommand line editing nonoyesyes*yesJob control noyesyesyesyes* Not the default setting for this shell.Reference: http://unixhelp.ed.ac.uk/shell/oview1.1.html
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  TopicsSHELL1Different types ofshell
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  Summary of shellfeatures
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  Configuration files forshellsREDIRECTION OF OUTPUT AND INPUT 2Redirect descriptor
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  Redirect usage12Configuration filesfor shellsshkshcshtcshbash/etc/.loginloginlogin/etc/csh.cshrcyesyes/etc/csh.loginloginlogin~/.tcshrcyes~/.cshrcyesyes~/.loginloginlogin~/.logoutloginlogin/etc/profileloginloginlogin~/.profileloginloginlogin~/.bash_profilelogin~/.bash_loginlogin~/.bash_logoutlogin~/.bashrcint. + n/login blank means a file is not read by a shell at all."yes" means a file is always read by a shell upon startup."login" means a file is read if the shell is a login shell."n/login" means a file is read if the shell is not a login shell."int." means a file is read if the shell is interactive.Reference: http://en.wikipedia.org/wiki/Unix_shell
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  TopicsSHELL1Different types ofshell
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  Summary of shellfeatures
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  Configuration files forshellsREDIRECTION OF OUTPUT AND INPUT 2Redirect descriptor
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  Redirect usage12Redirect descriptorDescriptorDescription0StandardInput (Generally Keyboard)1Standard output (Generally Display/Screen)2Standard Error Ouput (Generally Display/Screen)>Redirect standard output2>Redirect standard error2>&1Redirect standard error to standard output<Redirect standard input from>>Append to standard output&Run as background process
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  TopicsSHELL1Different types ofshell
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  Summary of shellfeatures
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  Configuration files forshellsREDIRECTION OF OUTPUT AND INPUT 2Redirect descriptor
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  Redirect usage12Redirect usageLetme write the example about how to use redirection in various purpose.Redirect standard output to a file #!/bin/bash/home/panu/start-application1.sh > fileAppend standard output to a file #!/bin/bash/home/panu/start-application1.sh >> fileRedirect standard input from file#!/bin/bash/home/panu/start-application1.sh < fileRedirect standard output to “std_out.log” and redirect standard error to “std_error.log”#!/bin/bash/home/panu/start-application1.sh > std_out.log  2> std_err.logRedirect standard error to standard output “std_out_err.log”#!/bin/bash/home/panu/start-application1.sh > std_out_err.log  2>&1
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  Thank you forwatchingmy presentationCreated bypanuausavasereelertblog: http://panu.in.themail: panu@panu.in.thtwitter: @panuinth