Commands tagged io sorted by votes

Commands tagged io (5)

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Test disk I/O

Especially useful to gauge the performance of a VPS. Show Sample Output
This is sample output - yours may be different.
```
16384+0 records in
16384+0 records out
1073741824 bytes (1.1 GB) copied, 6.10176 seconds, 176 MB/s
```
2

dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync

marcel · 2011-08-14 16:37:06 4
Slow down IO heavy process

Some IO intensive process make the system unresponsive. This function periodically starts/stops a process, which hopefully releases some resources for other activities. This function is useful when ionice is not available Show Sample Output
This is sample output - yours may be different.
```
bash> cp /tmp/BIG /tmp/2 & slow $!
[1] 26494
[2] 26495
```
1

slow () { [ -n $1 ] && while ps -p $1 >/dev/null ; do kill -STOP $1; sleep 1; kill -CONT $1; sleep 1; done & }

igorfu · 2012-05-16 12:13:30 4
Find processes blocked on IO
This is sample output - yours may be different.
0

while [ 1 ] ;do ps aux|awk '{if ($8 ~ "D") print }'; sleep 1 ;done

paulp · 2014-01-21 08:20:04 7
Watch Processes with D status (sleep and wait for IO)
This is sample output - yours may be different.
0

watch -n 1 "(ps aux | awk '\$8 ~ /D/ { print \$0 }')"

ara4sh · 2017-04-15 10:39:02 18
Slow down IO heavy process

compare to alternative : - directly tests the -STOP of the process to continue or stop loop, - background operator should be set (or not) at the call of the function For extension i suggest a slowPID() based on kill like above and a slowCMD based on killall.
This is sample output - yours may be different.
-1

slow () { [ -n $1 ] && while kill -STOP $1; do sleep 1; kill -CONT $1; sleep 1; done }

makidoko · 2012-05-16 19:16:50 4

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Update zone file Serial numbers

Will edit *.db files in the same directory with todays date. Useful for doing a mass update to domains on a nameserver, adding spf records, etc. Looks for a string starting with 200 or 201 followed by 7 numbers, and replaces with todays date. This won't overwrite Ip's but i would still do some double checking after running this. Make sure your server's date is correct, otherwise insert your own serial number. $rndc reload should usually follow this command.

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)

Prefix every line with a timestamp

Show the UUID of a filesystem or partition

Shows the UUID of a filesystem or partition that can be used in kernel root options and in fstab. Run it without the -u option to generate more information. eg: ~/ sudo vol_id /dev/sda2 ID_FS_USAGE=other ID_FS_TYPE=swap ID_FS_VERSION=2 ID_FS_UUID=27fca13d-97b7-4d28-882c-6d03353f0a82 ID_FS_UUID_ENC=27fca13d-97b7-4d28-882c-6d03353f0a82 ID_FS_LABEL= ID_FS_LABEL_ENC=

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Get the dir listing of an executable without knowing its location

Remove any RPMs matching a pattern

This should be an option to rpm, but isn't. I wind up using it a lot because I always forget the full name of the packages I want to delete.

Change permissions of every directory in current directory

"find . -type d -print0 | xargs -0 chmod 755" thanks masterofdisaster

Binary search/replace

Replace all instances of "A" with "B" in file "source" saved as file "destination". !! IF A/B is multi-byte, then separate bytes with spaces like so: "s/20\ 0A/00/g".

Jump to a song in your XMMS2 playlist, based on song title/artist

Usage: Declare this function in your Shell, then use it like this: $> jumpTo foo The script will search for the 'foo' pattern in your current xmms2 playlist (artist or songname), and play the first occurence of it !

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Commands tagged io (5)

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