Commands by programmer (5)

  • Create a bash script to change the modification time for each file in 'files.txt' such that they are in the same order as in 'files.txt' File name for bash script specified by variable, 'scriptName'. It is made an executable once writing into it has been completed. Show Sample Output


    1
    scriptName="reorder_files.sh"; echo -e '#!/bin/sh\n' > "${scriptName}"; cat files.txt | while read file; do echo "touch ${file}; sleep 0.5;" >> "${scriptName}"; done; chmod +x "${scriptName}";
    programmer · 2016-04-19 11:52:00 3
  • Removing Course name prefix added Show Sample Output


    1
    ls *.pdf | while read file; do newfile="${file##CS749__}"; mv "${file}" "${newfile}"; done;
    programmer · 2016-04-19 11:06:43 5
  • Adding course name prefix to lecture pdfs Show Sample Output


    1
    ls *.pdf | while read file; do newfile="CS749__${file}"; mv "${file}" "${newfile}"; done;
    programmer · 2016-04-19 11:04:47 3
  • retrieve file names back from touch commands for them Show Sample Output


    1
    touch files.txt; cat reorder_files.sh | while read line; do x=`echo $line | sed 's/touch \([a-z0-9\.]\+.*.pdf\);.*/\1/'`; echo $x >> files.txt ; done;
    programmer · 2016-04-19 11:01:17 1
  • useful to find the list of dependencies Show Sample Output


    2
    jar -tf file.jar
    programmer · 2010-10-13 10:53:07 0

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get a random 0/1, use it for on/off, yes/no
use it to add a random boolean switch to your script

Do some learning...
I like it sorted... 2> /dev/null was also needless, since our pipes already select stdin, only.

A fun thing to do with ram is actually open it up and take a peek. This command will show you all the string (plain text) values in ram

Does a full update and cleaning in one line

top svn committers (without awk)
list top committers (and number of their commits) of svn repository. in this example it counts revisions of current directory.

Using Git, stage all manually deleted files.
-u tells git to automatically stage all changes to files in the index (eg. deleted and modified files). See: http://stackoverflow.com/questions/1402776/how-do-i-commit-all-deleted-files-in-git http://kernel.org/pub/software/scm/git/docs/git-add.html

Automatically update all the installed python packages

Rename files in batch

VMware Server print out the state of all registered Virtual Machines.
I use this command on my machines running VMware Server to print out the state of all registered Virtual machines.

exit without saving history
this exits bash without saving the history. unlike explicitly disabling the history in some way, this works anywhere, and it works if you decide *after* issuing the command you don't want logged, that you don't want it logged ... $$ ( or ${$} ) is the pid of the current bash instance this also works perfectly in shells that don't have $$ if you do something like $ kill -9 `readlink /proc/self`


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