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using tee to echo to a system file with sudo privileges
We sometimes need to change kernel parameters by echoing the file . This needs root privilege and if we do it using sudo like this , it fails $ sudo echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor -bash: /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor: Permission denied We can achieve this with the tee command by just doing sudo without logging as root user http://www.zaman4linux.in/2010/09/using-tee-to-echo-to-system-file-with.html

Install pip with Proxy
Installs pip packages defining a proxy

Remove leading zeros in multiple columns with sed
Leading zeros might help correct sorting and they can be removed by sed after sorting

Join the content of a bash array with commas
This type of join is clearly documented in the bash manual. Only the first character of IFS is used for the delimiter.

Email a file to yourself
This uses mutt to send the file, and doesn't require uuencode etc

find out how much space are occuipied by files smaller than 1024K (sic) - improved
The original didn't use -print0 which fails on weird file names eg with spaces. The original parsed the output of 'ls -l' which is always a bad idea.

Extract JPEG images from a PDF document
This will extract all DCT format images from foo.pdf and save them in JPEG format (option -j) to bar-000.jpg, bar-001.jpg, bar-002.jpg, etc. Inspired by http://stefaanlippens.net/extract-images-from-pdf-documents

rgrep: recursive grep without .svn
Only excludes .svn from filenames.

Count lines using wc.

List files opened by a PID
Lis all files opened by a particular process id. "PID"


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