Commands by al3x

Commands by al3x (7)

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List shared libraries recognized by the system

Allows to check if shared library could be dynamically loaded
This is sample output - yours may be different.
0

ldconfig -p | grep <somenewlib.so>

al3x · 2009-02-07 23:15:38 0
Check executable shared library usage

provides list of shared libraries required by executable Show Sample Output
This is sample output - yours may be different.
```
# ldd /bin/bash
        linux-gate.so.1 =>  (0x00ba2000)
        libtermcap.so.2 => /lib/libtermcap.so.2 (0x00484000)
        libdl.so.2 => /lib/libdl.so.2 (0x003c5000)
        libc.so.6 => /lib/libc.so.6 (0x00280000)
        /lib/ld-linux.so.2 (0x0025d000)
```
2

ldd <executable binary>

al3x · 2009-02-07 23:13:40 0
check rpm pkg content w/o installation

allows to check inside rpm file w/o installing it
This is sample output - yours may be different.
0

rpm -qlp <package.rpm>

al3x · 2009-02-07 23:11:59 0
list file descriptors opened by a process

Useful for examining hostile processes (backdoors,proxies)
This is sample output - yours may be different.
1

ls -al /proc/<PID>/fd

al3x · 2009-02-07 22:57:03 0
grep selectively

allows to grep very narrow subset of files
This is sample output - yours may be different.
0

find /path -name \*.php -user nobody -exec grep -nH whatever {} \;

al3x · 2009-02-07 20:53:56 0
fix broken permissions
This is sample output - yours may be different.
4

find /path -type d -perm 777 -exec chmod 755 {} \;

al3x · 2009-02-07 20:51:06 0
find out about a process

Good to find out about hostile processes Show Sample Output
This is sample output - yours may be different.
```
USER=rootLOGNAME=rootHOME=/rootPATH=/usr/bin:/bin:/usr/sbin:/sbinMAIL=/var/mail/rootSHELL=/bin/bashSSH_CLIENT=192.168.8.2 29998 22SSH_CONNECTION=192.168.8.2 29998 192.168.8.12 22SSH_TTY=/dev/pts/0TERM=linuxSSH_AUTH_SOCK=/tmp/ssh-IJZxdX8645/
```
0

cat /proc/<PID>/environ

al3x · 2009-02-07 20:49:19 2

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Rotate all jpeg images in current folder, rename them to EXIF datetime and set files timestamp to EXIF datetime

List the most recent dates in reverse-chronological order

bash brace expansion, sequence expression

reclaim your window titlebars (in ubuntu lucid)

Get length of current playlist in xmms2

Edit a file on a remote host using vim

Check if running in an X session

If you want to display a dialog (using xdialog/kdialog/zenity) you need to make sure that you have a valid X session. Checks for the existence of the DISPLAY variable.

sort ugly text

Often, when sorting you want the sort to ignore extraneous characters. The b, d, and f tell sort to ignore leading blanks, use 'dictionary order' (ignore punctuation), and ignore (fold) case. Add a "u" if you only want one copy of duplicate lines. This is a great command to use within vim to sort lines of text, using !}sort -bdf

How to copy CD/DVD into hard disk (.iso)

A dear friend of mine asked me how do I copy a DVD to your hard drive? If you want to make a copy of the ISO image that was burned to a CD or DVD, insert that medium into your CD/DVD drive and (assuming /dev/cdrom is associated with your computer?s CD drive) type the following command

check open ports without netstat or lsof

list block devices

Shows all block devices in a tree with descruptions of what they are.

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Commands by al3x (7)

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