Commands by programmer (5)

  • Create Bash script to change modification time of files

    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 Prefix from File name

    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 4
  • Adding Prefix to File name

    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 2
  • Get File Names from touch commands

    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
  • List contents of jar

    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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Sum size of files returned from FIND

find text in a file
this will find text in the directory you specify and give you line where it appears.

Remove color codes (special characters) with sed
Works great on Mac OSX.

Runs previous command replacing foo by bar every time that foo appears
Very useful for rerunning a long command changing some arguments globally. As opposed to ^foo^bar, which only replaces the first occurrence of foo, this one changes every occurrence.

Find and copy scattered mp3 files into one directory
I used this command to recursively gather all mp3 files that were previously imported into their own directories (sorted by band name) in Songbird.

Show word-by-word differences between two latex files, in color

Recover resolution when a fullscreen program crashes and you're stuck with a tiny X resolution
This forces X back to its maximum resolution configured. To get a list, type `xrandr'.

save man-page as pdf

uncomment the lines where the word DEBUG is found

watch your network load on specific network interface
-n means refresh frequency you could change eth0 to any interface you want, like wlan0

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