Commands by ClashTheBunny

Commands by ClashTheBunny (4)

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Recursively remove all empty directories

This will check if there are any empty directories, or newly emptied directories, in a list of directories. It will then delete all of those directories. It works with gnu find and OSX/BSD find.
This is sample output - yours may be different.
0

for foo in <list of directories>; do while find $foo -type d -empty 2>/dev/null| grep -q "."; do find $foo -type d -empty -print0 | xargs -0 rmdir; done; done

ClashTheBunny · 2012-05-23 08:09:16 1
Get the date for the last Saturday of a given month

Choosing your year and month. You only need the gnu date command and bash. desiredDay of the week is (1..7); 1 is Monday. If you want desiredDay of week (0..6); 0 is Sunday desiredDay=6; year=2012; month=5; n=0; while [ $(date -d "$year-$((month+1))-1 - $n day" "+%w") -ne $desiredDay ]; do n=$((n+1)); done; date -d "$year-$((month+1))-1 - $n day" "+%x" Show Sample Output
This is sample output - yours may be different.
```
05/26/2012
```
0

desiredDay=6; year=2012; month=5; n=0; while [ $(date -d "$year-$((month+1))-1 - $n day" "+%u") -ne $desiredDay ]; do n=$((n+1)); done; date -d "$year-$((month+1))-1 - $n day" "+%x"

ClashTheBunny · 2012-05-17 12:02:30 0
List all files in current dir and subdirs sorted by size

This doesn't require any non-standard programs.
This is sample output - yours may be different.
0

find . -printf "%s %p\n" | sort -n

ClashTheBunny · 2012-05-17 11:39:26 0
pad file names with zeros so that files sort easily

This command takes a few changes to get to the file format, but once you have that, you're good to go. Set your environment variables and then change the text "front" and "back" to whatever you're files start and end with. You'll end up with some easily sort-able files. Show Sample Output
This is sample output - yours may be different.
```
mv front1back front001back
mv front2back front002back
mv front3back front003back
mv front4back front004back
mv front5back front005back
mv front6back front006back
mv front7back front007back
mv front8back front008back
mv front9back front009back
mv front10back front010back
mv front11back front011back
mv front12back front012back
mv front13back front013back
mv front14back front014back
mv front15back front015back
```
0

zeros=3; from=1; to=15; for foo in $(seq $from $to); do echo mv "front${foo}back" "front$(printf "%0${zeros}d\n" $foo)back"; done

ClashTheBunny · 2012-05-17 10:54:45 0

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download specific files only from a website

check open ports without netstat or lsof

burn initial session on a growable DVD using growisofs

replace "directory name to burn on DVD" with actual directory name that you want to copy on DVD

List all files opened by a particular command

List all file opened by a particular command based on it's command name.

List all information about all files (in current dir)

This is a funny usage of the traditional command ls. It could be basically simplified as: $ ls -a -l Duplicating arguments is permitted: $ ls -a -l -l And this markup could be shortened as: $ ls -al Extra note: To view filesizes like a pro, pray for your God: $ ls -allah

bash find function

basic find implementation for systems that don't actually have find, like an android console without busybox installed.

Compress a series of png pictures to an avi movie.

cd /path/to/your/png_pics mencoder "mf://*.png" -mf fps=2 -o output.avi -ovc lavc -lavcopts vcodec=mpeg4 then you can get a movie named output.avi.

Send a binary file as an attachment to an email

The uuencode utility will encode your file so that it can be sent as an attachment to an email. It is part of the sharutils package in RHEL/CentOS/Fedora.

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

lotto generator

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