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it-tricks [2017/12/28 10:55]
lauschmannova [Editors] 		it-tricks [2018/03/08 18:03]
vidra Add info about invoking OOM-killer by SysRq+F
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   * See [[internal:remote access]], esp. for byobu and mosh.   * See [[internal:remote access]], esp. for byobu and mosh.
   * You **should not turn off** Linux workstations at ÚFAL, unless really needed (or agreed with it@ufal). In that case, try the standard ways, and if they do not work, try Ctrl+Alt+SysRq+[R,E,I,S,U,B] rather than plug out power cable. Mnemonics: "Reboot Even If System Utterly Broken", see http://en.wikipedia.org/wiki/Magic_SysRq_key#Uses   * You **should not turn off** Linux workstations at ÚFAL, unless really needed (or agreed with it@ufal). In that case, try the standard ways, and if they do not work, try Ctrl+Alt+SysRq+[R,E,I,S,U,B] rather than plug out power cable. Mnemonics: "Reboot Even If System Utterly Broken", see http://en.wikipedia.org/wiki/Magic_SysRq_key#Uses
 +    * SysRq has also other interesting uses: For example, if you manage to launch a program that exhausts all RAM, the system starts swapping and becomes unresponsive, you can recover by invoking the OOM-killer by pressing Ctrl+Alt+SysRq+F.
   * Ondřej Bojar has implemented many [[http://www1.cuni.cz/~obo/textutils/|Text utils]], which he likes to use in his scripts and advises his students to do so as well.   * Ondřej Bojar has implemented many [[http://www1.cuni.cz/~obo/textutils/|Text utils]], which he likes to use in his scripts and advises his students to do so as well.
     * The web versions of the text utils are often older than the ones in ''/home/bojar/tools/vimtext'' and ''/home/bojar/tools/shell''     * The web versions of the text utils are often older than the ones in ''/home/bojar/tools/vimtext'' and ''/home/bojar/tools/shell''
   * [[https://en.wikipedia.org/wiki/Shuf|shuf]] shuffle lines randomly (or in a given order with ''--random-source'')   * [[https://en.wikipedia.org/wiki/Shuf|shuf]] shuffle lines randomly (or in a given order with ''--random-source'')
  

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