Linux Bash Snippets

# recursively replace text in all files with a certain file ending

find . -type f -iname '*.html' -exec sed -i 's,href="../css/stylesheet.css",href="../../css/stylesheet.css",g' {} +



# download Springer Link Books via University Proxy and add the ".pdf" file ending

export http_proxy="http://proxy.zfn.uni-bremen.de:3128";
wget -r -l 1 --reject html,js,css,jpg,png --proxy-user STUD_IP_USERNAME --proxy-passwd STUD_IP_PASSWORD  LINK_TO_BOOK; 
for i in link.springer.com/content/pdf/*; 
  do j=`echo $i | cut -f 1`; j=$j".pdf"; 
  mv $i $j; 
done

# rename files downloaded from StudIP

rename 's/\[[0-9]+\]_//' *

# copy image files into a subdirectory and rescale them to a width of 1024

mkdir small_images;
for i in *.jpg; 
  do convert "$i" -resize 1024x "small/$i" ; 
done


# do continuous screenshots every 2 seconds

while true; do
    scrot -d 2 ~/screenshots/screenshot-%M-%S.png 
    
done


# autorotate all jpeg files in a directory according to EXIF information
jhead -autorot *.jpg

# do a full text search in all pdf files of a directory

mkdir findings; 
for i in *.PDF; 
  do pdftotext "$i" - | grep "KEYWORD" > findings/finding_in_$i.txt; 
done

# extract images from all pdf files in a directory
mkdir img; 
for i in *.pdf; 
  do pdfimages "$i" img/img_$i; 
done

# execute command one minute later
COMMAND | at now + 1 min

# enter system via live CD

# view partitions
sudo fdisk -l 
# unmount and mount again in case of error message
sudo mount -o rw /dev/sda7/ /mnt/sda7
sudo chroot /mnt/sda7

# convert all .mov files into .avi files
for i in *.mov; do ffmpeg -i $i.MOV -ar 44100 $i.avi; done

# convert .csv file to LateX table 
cat example.csv | sed "s/;/\t\&\t/g"|sed 's/$/\t\\\\/g' > example.tex

# extract audio from movie
ffmpeg -i film.mp4 -vn audio.wav

# show Ubuntu version
lsb_release -d

# eject DVD
eject -r

# kill skype process
kill `ps -e | grep skype | cut -d" " -f1`