Miscellaneous commands - Revision history

Christoph: /* Command-line calculator */

2021-09-10T23:38:42Z

‎Command-line calculator

2021-09-07T18:11:58Z

‎Misc

2019-07-08T01:57:12Z

‎Misc

2019-07-08T01:34:43Z

‎Check if an OS is 32- or 64-bit

2018-10-22T21:56:41Z

‎Check if an OS is 32- or 64-bit

2015-10-26T21:19:56Z

‎Check if an OS is 32- or 64-bit

2015-06-19T20:48:28Z

‎Stego trick using built-in Linux utilities

2015-06-19T20:47:33Z

‎Google tricks

2015-06-19T19:45:36Z

‎Misc

2015-06-05T21:42:10Z

‎Check if your OS is 32- or 64-bit

@@ Line 145: / Line 145: @@
 ==Command-line calculator==
   $ echo "111111111 * 111111111" | bc  # => 12345678987654321
   $ echo "sqrt(25)" | bc -qi  # => 5

@@ Line 267: / Line 267: @@
   $ finger -l
   #~OR~
-  pinky
+  $ pinky
 *Display distribution and version:
   $ cat /etc/issue

@@ Line 266: / Line 266: @@
 *Display information about all system users:
   $ finger -l
 *Display distribution and version:
   $ cat /etc/issue

@@ Line 213: / Line 213: @@
   # ~OR~
   x86_64  # <- 64-bit
   $ arch
@@ Line 219: / Line 224: @@
   # ~OR~
 * To see if your processor is 64-bit, you can run this command:
   $ egrep -c ' lm ' /proc/cpuinfo
-:If <code>0</code> is printed, it means that your CPU is not 64-bit.
+:If <code>0</code> is printed, it means that your CPU is ''not'' 64-bit.
-:If <code>1</code> or higher, it is. Note: <code>lm</code> stands for "Long Mode" which equates to a 64-bit CPU.
+:If <code>1</code> or higher, it is. Note: <code>lm</code> stands for "Long Mode" which equates to a 64-bit CPU. If, for an example, the above command(s) return something like "12", that means your CPU supports 12 x threads (2 x ''n'' cores) of 64-bit nodes.
 * Check if a remote host is running a 32- or a 64-bit [[Linux]] kernel:

@@ Line 203: / Line 203: @@
   Linux hostname 3.8.0-33-generic #48-Ubuntu SMP Wed Oct 23 17:26:34 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
   $ file /sbin/init
   /sbin/init: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV)...

@@ Line 198: / Line 198: @@
   $ uname -a
-If 32-bit, it will look something like:
+:If 32-bit, it will look something like:
-−
   Linux hostname 3.8.0-33-generic #48-Ubuntu SMP Wed Oct 23 17:26:34 UTC 2013 i686 i686 i686 GNU/Linux
+:If 64-bit:
 If 64-bit:
   Linux hostname 3.8.0-33-generic #48-Ubuntu SMP Wed Oct 23 17:26:34 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
@@ Line 220: / Line 218: @@
   # ~OR~
 * Check if a remote host is running a 32- or a 64-bit [[Linux]] kernel:

@@ Line 167: / Line 167: @@
 ==Stego trick using built-in Linux utilities==
   $ cat foo.zip >> bar.gif  # "hides" 'foo.zip' inside 'bar.gif'
   $ qiv bar.gif     # views just fine (note: you can use any image viewer you like here)

@@ Line 13: / Line 13: @@
   rphonebook: John Doe Portland OR
   bphonebook: Blue Sushi Seattle WA
 Note: See [http://www.googletutor.com/google-manual/ Google Search Manual] and [http://projects.felipc.com/gcl/ Google command line help] for more tricks.

@@ Line 276: / Line 276: @@
 *Get the number of days since the root password was last changed:
   $ echo "$(echo `date +%s`/86400|bc) - $(sudo awk -F: /^root/'{print $3}' /etc/shadow)" | bc
 ==See also==

@@ Line 190: / Line 190: @@
   see: [http://www.smashingmagazine.com/2007/06/14/creative-favicons-when-small-is-beautiful/ Creative Favicons: When Small Is Beautiful] for ideas
-==Check if your OS is 32- or 64-bit==
+==Check if an OS is 32- or 64-bit==
   $ uname -a
@@ Line 216: / Line 216: @@
   # ~OR~
 ==Misc==