Commands by greggster (7)

  • Use vim's diff mode to edit two or more files in one window. The '+diffoff!' turns off diff highlighting when the session is started. Use ctrl+w + ctrl+w to switch between windows. Show Sample Output


    2
    vim -d '+diffoff!' file1 file2
    greggster · 2012-08-30 07:51:41 0
  • Sort lines within vi editor. In this example sort lines 33-61 and lines 4-9 asciibetically. Show Sample Output


    6
    :33,61 !sort
    greggster · 2011-05-06 06:10:05 1
  • rm -rf .* matches ".." and thus one goes up a level and wipes out more than intended. In bash, .??* safely accomplishes what one intends - remove those .files The ? matches most characters except "/", thus .?? does not match ../ and so one is safe. Show Sample Output


    0
    rm -rf .??*
    greggster · 2011-03-11 07:21:58 5
  • When setting up a new aliases file, or having creating a new file.. About every time after editing an aliases file, I source it. This alias makes editing alias a bit easier and they are useful right away. Note if the source failed, it will not echo "aliases sourced". Sub in vi for your favorite editor, or alter for ksh, sh, etc.


    7
    alias va='vi ~/.aliases; source ~/.aliases && echo "aliases sourced"'
    greggster · 2011-03-10 06:41:37 1
  • This is for bash - make an alias - also a good blueprint for making aliases that take arguments to functions. If for Solaris use "-size +${1}000000c" to replace "-size +${1}M" Show Sample Output


    0
    alias big='BIG () { find . -size +${1}M -ls; }; BIG $1'
    greggster · 2011-03-10 06:33:00 1
  • until (ssh root@10.1.1.39 2> /dev/null); do date; sleep 15; done In this case will execute "date" then "sleep 15" until we are able to ssh into server, such as after a reboot Could also be like: until ( ping 10.1.1.39 1> /dev/null); do echo "server 10.1.1.39 is down"; sleep 15; done Show Sample Output


    8
    until (ssh root@10.1.1.39 2> /dev/null); do date; sleep 15; done
    greggster · 2011-03-08 08:42:12 2
  • This is useful for quickly jumping around branches in a file system, or operating on a parellel file. This is tested in bash. cd to (substitute in PWD, a for b) where PWD is the bash environmental variable for the "working directory" Show Sample Output


    7
    cd ${PWD/a/b}
    greggster · 2011-03-03 06:27:12 4

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Delete all non-printing characters from a file
tr has some predefined sets of characters that are more convenient to use than characters codes

Save a file you edited in vim without the needed permissions
Calls sudo tee like all the other lines, but also automatically reloads the file. Optionally you can add command Wq :execute ':W' | :q and command WQ :Wq to make quitting easier

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external projector for presentations
i spent way too many hours trying to fiddle with /etc/X11/xorg.conf trying to hook up various external projectors. too bad i didn't know this would solve all my problems.

Get notified when a job you run in a terminal is done, using NotifyOSD
This is an alias you can add to your .bashrc file to get notified when a job you run in a terminal is done. example of use sleep 20; alert Source:http://www.webupd8.org/2010/07/get-notified-when-job-you-run-in.html

Python extract json

List all installed PERL modules by CPAN
This command will give you the detailed information about the installed perl modules i.e. installed path, Link type, version, files etc.

Show whats going on restoring files from a spectrum protect backup
spectrum protect's dsmc command shows file names and total amount of restore. This command shows which files are actually open and their siz in GB and highlights the change to the previous output

Search some text from all files inside a directory

Get AWS temporary credentials ready to export based on a MFA virtual appliance
You might want to secure your AWS operations requiring to use a MFA token. But then to use API or tools, you need to pass credentials generated with a MFA token. This commands asks you for the MFA code and retrieves these credentials using AWS Cli. To print the exports, you can use: `awk '{ print "export AWS_ACCESS_KEY_ID=\"" $1 "\"\n" "export AWS_SECRET_ACCESS_KEY=\"" $2 "\"\n" "export AWS_SESSION_TOKEN=\"" $3 "\"" }'` You must adapt the command line to include: * $MFA_IDis ARN of the virtual MFA or serial number of the physical one * TTL for the credentials


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