ls -l /var/lib/rpm rm -f /var/lib/rpm/__db* rpm -vv –rebuilddb rm /var/run/yum.pid yum yum clean all OPTIONAL: yum update

Capture and create MP4 from live AVCHD video camcorder using ffmpeg. This is an example using the AVCHD input from a SONY or PANASONIC HD camera on Windows. I use cygwin so I can create pipes or automate things in Windows. I use ffmpeg.exe to grab the video from the camera and convert/re-encode to other formats …

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Print the number of bytes of storage capacity the current directory recursively uses:

ls -lR $1 | grep -v ^d | awk ‘{total+=$5;} END {print total;}’

Turn off color in vi 

:syntax off

Line count output (rate) per 1 second (e.g. to determine # of apache web requests at 1 second intervals)

tail -f access.log|perl -e ‘while (<>) {$l++;if (time > $e) {$e=time;print “$l\n”;$l=0}}’

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