Commands by jyoder

Commands by jyoder (4)

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List all the files that have been deleted while they were still open.

If your customer deletes a file that is still in use by a process, that space does not get freed up (will not show up in df) until that process either closes the file on its own, or is killed.
This is sample output - yours may be different.
2

lsof | egrep "^COMMAND|deleted"

jyoder · 2009-03-12 23:11:26 5
Create a listing of all possible permissions and their octal representation.
This is sample output - yours may be different.
3

touch /tmp/$$;for N in `seq -w 0 7777|grep -v [89]`; do chmod $N /tmp/$$; P=`ls -l /tmp/$$ | awk '{print $1}'`; echo $N $P; done;rm /tmp/$$

jyoder · 2009-03-05 15:24:41 10
Find out the last times your system was rebooted (for the duration of wtmp).

Show Sample Output
This is sample output - yours may be different.
```
last reboot
reboot   system boot  2.6.26-1-686     Wed Feb 18 09:08 - 12:20 (2+03:11)   
reboot   system boot  2.6.26-1-686     Fri Feb 13 13:25 - 09:07 (4+19:42)   

wtmp begins Mon Feb  2 10:26:13 2009
```
3

last reboot

jyoder · 2009-02-20 19:21:40 6
Find the processes that are on the runqueue. Processes with a status of

Want to know why your load average is so high? Run this command to see what processes are on the run queue. Runnable processes have a status of "R", and commands waiting on I/O have a status of "D". On some older versions of Linux may require -emo instead of -eo. On Solaris: ps -aefL -o s -o user -o comm | egrep "^O|^R|COMMAND" Show Sample Output
This is sample output - yours may be different.
```
ps -eo stat,pid,user,command | egrep "^STAT|^D|^R"
STAT   PID USER     COMMAND
Rs    9215 oracle   oracleORA1 (LOCAL=NO)
Rs   12090 oracle   oracleORA1 (LOCAL=NO)
Rs   22965 oracle   ora_lmd0_ORA1
R+   26044 root     ps -eo stat,pid,user,command
Rs   29344 oracle   oracleORA1 (LOCAL=NO)
Rs   29352 oracle   oracleORA1 (LOCAL=NO)
```
4

ps -eo stat,pid,user,command | egrep "^STAT|^D|^R"

jyoder · 2009-02-20 19:00:17 7

What's this?

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Convert a string to

Use QEMU to create a hardware dual-boot without rebooting

After downloading an ISO image, assuming you have QEMU installed, it’s possible to boot an ISO image in a virtual machine and then install that ISO from within the virtual machine directly to a physical drive, bypassing the need to reboot. Simply pass the ISO image as the -cdrom parameter, followed by “format=raw,file=/dev/sdb” (replace /dev/sdb with the drive you want to install to) as the hard drive parameter (making absolutely certain to specify the raw format, of course). Once you boot into the ISO image with QEMU, just run the installer as if it were a virtual machine — it’ll just use the physical device as an install target. After that, you’ll be able to seamlessly boot multiple distros (or even other operating systems) at once.

Mirror rubygems.org

https://github.com/rubygems/rubygems-mirror/issues/20

Remove empty directories

You can also use, $ find . -depth -type d -exec rmdir {} \; 2>/dev/null

Convert CSV to JSON

Replace 'csv_file.csv' with your filename.

Define a quick calculator function

POSIX compliant arithmetic evaluation. = 10*2+3

Lists unambigously names of all xml elements used in files in current directory

This set of commands was very convenient for me when I was preparing some xml files for typesetting a book. I wanted to check what styles I had to prepare but coudn't remember all tags that I used. This one saved me from error-prone browsing of all my files. It should be also useful if one tries to process xml files with xsl, when using own xml application.

Binary clock

displays current time in "binary clock" format (loosely) inspired by: http://www.thinkgeek.com/homeoffice/lights/59e0/ "Decoding": 8421 .... - 1st hour digit: 0 *..* - 2nd hour digit: 9 (8+1) .*.. - 1st minutes digit: 4 *..* - 2nd minutes digit: 9 (8+1) Prompt-command version: PROMPT_COMMAND='echo "10 i 2 o $(date +"%H%M"|cut -b 1,2,3,4 --output-delimiter=" ") f"|dc|tac|xargs printf "%04d\n"|tr "01" ".*"'

Lists installed kernels

convert ascii string to hex

Even adds a newline.

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