Commands by omatictost

Commands by omatictost (11)

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Dump bash command history of an active shell user.
This is sample output - yours may be different.
8

APID=<pid number>; gdb -batch --eval "attach $APID" --eval "call write_history(\"/tmp/bash_history-$APID.txt\")" --eval 'detach' --eval 'q'

omatictost · 2012-10-25 18:46:56 16
SAR - List top CPU usage spikes over the last month using sar.
This is sample output - yours may be different.
-1

ls /var/log/sa/sa[0-9]*|xargs -I '{}' sar -u -f {}|awk '/^[0-9]/&&!/^12:00:01|RESTART|CPU/{print "%user: "$4" %system: "$6" %iowait: "$7" %nice: "$5" %idle: "$9}'|sort -nk10|head

omatictost · 2012-10-25 18:27:47 6
AWK example of using substr + index to print strings in an unknown position.
This is sample output - yours may be different.
0

awk '{word=(substr($0,index($0,"blah"),5));print word}'

omatictost · 2012-10-25 17:52:05 6
Sort I/O activity by PID number.
This is sample output - yours may be different.
0

for i in $(ps -eo pid|grep -v PID);do echo ""; echo -n "==$i== ";awk '/^read|^write/{ORS=" "; print}' /proc/$i/io 2>/dev/null; echo -n " ==$i=="; done|sort -nrk5|awk '{printf "%s\n%s %s\n%s %s\n%s\n\n",$1,$2,$3,$4,$5,$6}'

omatictost · 2012-10-25 17:16:24 5
SAR - Get the monthly queue length average using sar -q for both the runq-sz and plist-sz.
This is sample output - yours may be different.
0

ls /var/log/sa/sa[0-9]*|xargs -I '{}' sar -q -f {}| awk '/Average/'|awk '{runq+=$2;plist+=$3}END{print "average runq-sz:",runq/NR; print "average plist-sz: "plist/NR}'

omatictost · 2012-10-25 17:04:48 9

SAR - List the average memory usage for all days recorded under '/var/log/sa/*' using sar -r.

for i in `ls /var/log/sa/|grep -E "sa[0-9][0-9]"`;do echo -ne "$i -- ";sar -r -f /var/log/sa/$i|awk '{ printf "%3.2f\n",($4-$6-$7)*100/(3+$4)}'|grep -Eiv "average|linux|^ --|0.00|^-" |awk '{sum+=$1 }END{printf "Average = %3.2f%%\n",sum/NR}';done

omatictost · 2012-10-25 17:00:58 4

Recursively sort files by modification time through multiple directories.
This is sample output - yours may be different.
0

find /test -type f -printf "%AY%Aj%AH%AM%AS---%h/%f\n" | sort -n

omatictost · 2012-10-25 16:22:48 5
Print a single character from a string with AWK.
This is sample output - yours may be different.
0

echo "abcdefg"|awk 'BEGIN {FS="''"} {print $2}'

omatictost · 2012-10-25 16:12:28 12
Aligns NIC device names and associated IPs.
This is sample output - yours may be different.
0

/sbin/ifconfig |awk '/bond|eth/{getline i;printf $0" ";printf "%s\n", i" "}'|awk '{print $1,substr($7,6)}'

omatictost · 2012-10-25 16:08:15 5
comment / uncomment a line in a file using sed.

Show Sample Output
This is sample output - yours may be different.
```
comment:
$ sed -i 's/blah.*/#&/g' file.txt 
$ cat file.txt 
dugh
#blah
adfas
sdfkb
#blah
asdfkk
#blah

uncomment:
$ sed -i 's/.$blah*.$/\1/g' file.txt
$cat file.txt 
dugh
blah
adfas
sdfkb
blah
asdfkk
blah
```
0

(comment:) $ sed -i 's/blah.*/#&/g' file.txt (uncomment:) $ sed -i 's/.$blah*.$/\1/g' file.txt

omatictost · 2012-10-25 16:00:29 229
Display EPOCH time in human readable format using AWK.
This is sample output - yours may be different.
0

echo 1268727836 | awk '{print strftime("%c",$1)}'

omatictost · 2012-10-25 15:39:08 6

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PulseAudio: set the volume via command line

If you have more than one SINK

list files recursively by size

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)

Recursive chmod all files and directories within the current directory

List docker volumes by container

Print permanent subtitles on a video

It prints myvideo.srt subtitle files in myvideo.avi, saving it in myvideo_subtitled.avi

Most simple way to get a list of open ports

background a wget download

Cancel all aptitude scheduled actions

Very handy if you have done a package selection mistake in aptitude. Note that it's better to do a Ctrl+U (undo) in aptitude if possible, because the keep-all will clear some package states (like the 'hold' state).

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