Commands by unixhome

Commands by unixhome (6)

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Find the real procesor speed when you use CPU scaling [cpuspeed]

We don't use CPU scaling, but just in case you do, there is something interesting to note. If you look at the /proc/cpuinfo, the speed listed is current running speed of the processors and not the real speed of the chip. Show Sample Output
This is sample output - yours may be different.
```
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor (or core) running speed is: 1000.000
Processor real speed is: 2800 MHz
Processor real speed is: 2800 MHz
Processor real speed is: 2800 MHz
Processor real speed is: 2800 MHz
```
2

awk -F": " '/cpu MHz\ */ { print "Processor (or core) running speed is: " $2 }' /proc/cpuinfo ; dmidecode | awk -F": " '/Current Speed/ { print "Processor real speed is: " $2 }'

unixhome · 2010-02-19 21:20:18 561
See your current RAM frequency

man dmidecode [look for type] Show Sample Output
This is sample output - yours may be different.
```
[root@ronfedora ~]# dmidecode -t 17 | awk -F":" '/Speed/ { print $2 }'
 533 MHz
 533 MHz
```
10

dmidecode -t 17 | awk -F":" '/Speed/ { print $2 }'

unixhome · 2010-02-19 12:15:13 17
Function to split a string into an array
This is sample output - yours may be different.
0

Split() { SENT=${*} ; sentarry=( ${SENT} ) ; while [[ ${#sentarry[@]} -gt 0 ]] ; do printf "%s\n" "${sentarry[0]}" ; sentarry=( ${sentarry[@]:1} ) ; done ; }

unixhome · 2010-02-09 20:32:56 4
How many days until the end of the year
This is sample output - yours may be different.
4

echo "There are $(($(date +%j -d"Dec 31, $(date +%Y)")-$(date +%j))) left in year $(date +%Y)."

unixhome · 2010-02-06 00:15:40 14
Test file system type before further commands execution

Exclude 400 client hosts with NFS auto-mounted home directories. Easily modified for inclusion in your scripts. Show Sample Output
This is sample output - yours may be different.
```
DIR=. ; FSTYPE=$(df -TP ${DIR} | grep -v Type | awk '{ print $2 }') ; echo "${FSTYPE}"
ext3
```
1

DIR=. ; FSTYPE=$(df -TP ${DIR} | grep -v Type | awk '{ print $2 }') ; echo "${FSTYPE}"

unixhome · 2009-12-22 14:01:50 4
Sometimes you just want a quick way to find out if a certain user account is locked [Linux].
This is sample output - yours may be different.
0

awk -F":" '{ print $1 }' /etc/passwd | while read UU ; do STATUS=$(passwd -S ${UU} | grep locked 2>/dev/null) ; if [[ ! -z ${STATUS} ]] ; then echo "Account ${UU} is locked." ; fi ; done

unixhome · 2009-12-18 14:28:15 12

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Indicates the position of my monitor buttons

I often need to change the brightness of my monitor. The symbols of the sensor buttons are not illuminated and on a black background .... invisible! Now i use osd_cat instead of a torch ;-)

get time in other timezones

On Ubuntu, if tzwatch is installed, then you can call up in terminal the output for every time zone configured in gWorldClock.

Look for English words in /dev/urandom

Little faster alternative.

list files recursively by size

Make sudo forget password instantly

By default sudo 'remembers' password for a few minutes, so that you do not need to re-enter password for a series of sudo commands that might follow within a short time duration. However, sometime you might want sudo to instantly 'forget' the password. (Next sudo command will need you to reenter the password) Credit: I first learned this while listening to one of the 'tuxradar' podcast.

url shortner using google's shortner api

First get a api key for google url shortner from here https://developers.google.com/url-shortener/ Then replace the API_KEY in the command

Force the script to be started as root

Place this code at the beginning of your script to ensure that it can only be executed by the root.

Extract the contents of an RPM package to your current directory without installing them.

This assumes you have the 'rpm', 'rpm2cpio' and 'cpio' packages installed. This will extract the contents of the RPM package to your current directory. This is useful for working with the files that the package provides without installing the package on your system. Might be useful to create a temporary directory to hold the packages before running the extraction: $ mkdir /tmp/new-package/; cd /tmp/new-package

Convert seconds to [DD:][HH:]MM:SS

Converts any number of seconds into days, hours, minutes and seconds. sec2dhms() { declare -i SS="$1" D=$(( SS / 86400 )) H=$(( SS % 86400 / 3600 )) M=$(( SS % 3600 / 60 )) S=$(( SS % 60 )) [ "$D" -gt 0 ] && echo -n "${D}:" [ "$H" -gt 0 ] && printf "%02g:" "$H" printf "%02g:%02g\n" "$M" "$S" }

This command can be used to extract the IP address of the network.

can be used within a script to configure iptables for example: iface=$2 inet_ip=`ifconfig "$iface" | grep inet | cut -d: -f2 | cut -d ' ' -f1` ipt="sudo /sbin/iptables" ......................... ---------------------------------------------------------------------------------------------------------------- $ipt -A INPUT -i $iface ! -f -p tcp -s $UL -d $inet_ip --sport 1023: --dport 3306 -m state --state NEW,ESTABLISHED -j ACCEPT ---------------------------------------------------------------------------------------------------------------- ----------------------------------------------------------------------------------------------------------------- $ipt -A OUTPUT -o $iface -p tcp -s $inet_ip -d $UL --sport 3306 --dport 1023: -m state --state ESTABLISHED,RELATED -j ACCEPT -----------------------------------------------------------------------------------------------------------------

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