Commands by homoludens

Commands by homoludens (7)

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convert png images to jpg and optimize them
This is sample output - yours may be different.
0

ls *.png | cut -d . -f 1 | xargs -L1 -i convert -strip -interlace Plane -quality 80 {}.png {}.jpg

homoludens · 2014-10-29 10:22:03 9
optimize all png images
This is sample output - yours may be different.
0

find . -name *.png | xargs optipng -nc -nb -o7 -full

homoludens · 2014-10-29 10:17:31 10
resize canvas of image and fill it with transparence
This is sample output - yours may be different.
0

convert input.png -gravity NorthWest -background transparent -extent 720x200 output.png

homoludens · 2012-11-22 15:10:45 5
remove execute bit only from files. recursively
This is sample output - yours may be different.
2

find . -type f -exec chmod -x {} \;

homoludens · 2011-07-25 10:49:26 5
resize all JPG images in folder and create new images (w/o overwriting)
This is sample output - yours may be different.
0

ls *.JPG | cut -d . -f 1 | xargs -L1 -i convert -resize 684 {}.JPG {}.jpg

homoludens · 2010-09-12 19:47:38 4
remove script from infected html files

recursive find and replace. important stuff are grep -Z and zargs -0 which add zero byte after file name so sed can work even with file names with spaces.
This is sample output - yours may be different.
0

grep -ZlRr -e BAD_SCRIPT_LINE * |xargs -0 sed -i 's/BAD_SCRIPT_LINE//g'

homoludens · 2010-08-30 22:12:57 6
Find installed packages that are not in the portage tree anymore.

Problem arises when ebuild gets removed from portage and you end up with old and unmaintained package that you cannot find standard way. This oneliner will give you list of those packages. Show Sample Output
This is sample output - yours may be different.
```
stat: cannot stat `/usr/portage/virtual/ghostscript': No such file or directory
stat: cannot stat `/usr/portage/virtual/mpg123': No such file or directory
stat: cannot stat `/usr/portage/virtual/poppler': No such file or directory
```
0

for f in $(qlist -IC); do stat /usr/portage/"$f" > /dev/null; done

homoludens · 2010-08-09 11:29:55 6

What's this?

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Create a mirror of a local folder, on a remote server

Create a exact mirror of the local folder "/root/files", on remote server 'remote_server' using SSH command (listening on port 22) (all files & folders on destination server/folder will be deleted)

run command on a group of nodes in parallel

Insert the last argument of the previous command

for example if you did a: $ ls -la /bin/ls then $ ls !$ is equivalent to doing a $ ls /bin/ls

In place line numbering

Add permanent line numbers to a file without creating a temp file. The rm command deletes file10 while the nl command works on the open file descriptor of file10 which it outputs into a new file again named file10. The new file10 will now be numbered in the same directory with the same file name and content as before, but it will in fact be a new file, using (ls -i) to show its inode number will prove this.

Locate config files of the program

Locate config files of the program. May not be used for interactive programs like vim.

Install pip with Proxy

Installs pip packages defining a proxy

Find the package that installed a command

Remind yourself to leave in 15 minutes

If you spend most of your time in front of the terminal, leave is a useful reminder. Leave can have absolute form: leave 1555 reminds you to leave at 3:55PM

Lists unambigously names of all xml elements used in files in current directory

This set of commands was very convenient for me when I was preparing some xml files for typesetting a book. I wanted to check what styles I had to prepare but coudn't remember all tags that I used. This one saved me from error-prone browsing of all my files. It should be also useful if one tries to process xml files with xsl, when using own xml application.

use the previous commands params in the current command

Here the !!:1 will take the first parameter from the previous command. This can be used in conjunction with other history commands like ! and so on.

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