Commands tagged procfs (2)

  • Checks whether IPv6 is enabled system-wide by reading from procfs. Show Sample Output


    1
    printf "IPv6 is "; [ $(cat /proc/sys/net/ipv6/conf/all/disable_ipv6) -eq 0 ] && printf "enabled\n" || printf "disabled\n"
    lordtoran · 2019-02-05 21:01:32 0
  • Sometimes you want to see all of the systcls for a given $thing. I happened to need to easily look at all of the vm sysctls between two boxes and compare them. This is what I came up with. Show Sample Output


    0
    find /proc/sys/vm -maxdepth 1 -type f | while read i ; do printf "%-35s\t%s\n" "$i" "$(<$i)" ; done | sort -t/ -k4
    SEJeff · 2012-05-25 16:34:16 0

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Get IPv4 of eth0 for use with scripts
Combines wgzhao's grep | awk | sed into one awk command.

Get absolut path to your bash-script
Another way of doing it that's a bit clearer. I'm a fan of readable code.

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Remove a line from a file using sed (useful for updating known SSH server keys when they change)
remove the host for the .ssh/know_host file

find out how much space are occuipied by files smaller than 1024K
The command gives size of all files smaller than 1024k, this information, together with disk usage, can help determin file system parameter (e.g. block size) or storage device (e.g. SSD v.s. HDD). Note if you use awk instead of "cut| dc", you easily breach maximum allowed number of records in awk.

Archive a directory with datestamp on filename
A useful bash function: gztardir() { if [ $# -ne 1 ] ; then echo "incorrect arguments: should be gztardir " else tar zcvf "${1%/}-$(date +%Y%m%d-%H%M).tar.gz" "$1" fi }

list files recursively by size

cut audio file

Extract audio from Mythtv recording to Rockbox iPod using ffmpeg
There are some pretty good live performances on late night TV. With Mythtv I record David Letterman, Jimmy Fallon, and Conan nightly all in HD from over the air broadcasts. If I find a live performance I like I copy it to my Rockboxed iPod using this command. The Rockbox firmware knows how to downmix 5.1 audio. The command above extracts the audio from the video starting at 58 minutes and 15 seconds. It ends at the end of the file since this was the last performance of the recording. The command creates an ac3 file. I copy the ac3 file to my Rockbox iPod and rock on.

Find top 10 largest files in /var directory (subdirectories and hidden files included )
Same as above, but modified to show human readable output


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