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Leave a comment Posted by BalaKrishnan on December 9, 2013

From Balakrishnan Vijayabaskar

Project Engineer at Wipro
Chennai Area, India

I’d like to add you to my professional network on LinkedIn.

– Balakrishnan

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Commands

Day 99:$gpg filename.gpg command (Decrypt)

2 Comments Posted by Praveen Srinivasan on September 24, 2011

ODOC:About gpg filename.gpg command

This command is used to Encrypt a file.

Example
Yesterday We learn about encrypt file in my desktop names “aaa.gpg”

Now i wish to decrypt a file

So goto desktop first,
Then type pgp aaa.gpg (filename.gpg)

praveen@praveen-desktop:~/Desktop$ gpg aaa.gpg
Enter passpharse: _
Repeat passpharse: _

please type passpharse that yesterday typed for encrypting.

After putting passpharse, it show’s like this

praveen@praveen-desktop:~/Desktop$ _

That’s all you are successfully Decrypt a file.
Now you can see encrypted file names “aaa” in your desktop

With Regards,
S. Praveen

Commands

Day 98:$gpg -c command

Leave a comment Posted by Praveen Srinivasan on September 23, 2011

ODOC:About gpg -c command

This command is used to Encrypt a file.

Example

I am creating a file names “aaa” in my desktop.
Then I am going to my desktop using cd command.
Then,

praveen@praveen-desktop:~/Desktop$ gpg -c aaa
Enter passpharse: _
Repeat passpharse: _

Now it ask passpharse for the file, Then ask retype passpharse.
After putting passpharse, it show’s like this

praveen@praveen-desktop:~/Desktop$ _

That’s all you are successfully created a Encrypted file.
Now you can see encrypted file names “aaa.gpg” in your desktop

With Regards,
S. Praveen

Commands

Day 94: $ps Command

Leave a comment Posted by Praveen Srinivasan on August 1, 2011

ODOC: About ps command
Reports the process status.

Syntax

-a -> List information about all processes most frequently requested: all those except process group leaders and processes not associated with a terminal.

-A -> List information for all processes. Identical to -e, below.

-c -> Print information in a format that reflects scheduler properties as described in priocntl.
The -c option affects the output of the -f and -l options, as described below.

-d -> List information about all processes except session leaders.

-e -> List information about every process now running.

-f -> Generate a full listing.

-j -> Print session ID and process group ID.

-l -> Generate a long listing.

-L -> Print information about each light weight process (lwp) in each selected process.

-P -> Print the number of the processor to which the process or lwp is bound, if any, under an additional column header, PSR.

-y -> Under a long listing (-l), omit the obsolete F and ADDR columns and include an RSS column to report the resident set size of the process. Under the -y option, both RSS and SZ will be reported in units of kilobytes instead of pages.

-g grplist -> List only process data whose group leader’s ID number(s) appears in grplist. (A group leader is a process whose process ID number is identical to its process group ID number.)

-n namelist -> Specify the name of an alternative system namelist file in place of the default. This option is accepted for compatibility, but is ignored.

-o format -> Print information according to the format specification given in format. This is fully described in DISPLAY FORMATS. Multiple -o options can be specified; the format specification will be interpreted as the space-character-separated concatenation of all the format option-arguments.

-p proclist -> List only process data whose process ID numbers are given in proclist.

-s sidlist -> List information on all session leaders whose IDs appear in sidlist.

-t term -> List only process data associated with term. Terminal identifiers are specified as a device file name, and an identifier. For example, term/a, or pts/0.

-u uidlist -> List only process data whose effective user ID number or login name is given in uidlist. In the listing, the numerical user ID will be printed unless you give the -f option, which prints the login name.

-U uidlist -> List information for processes whose real user ID numbers or login names are given in uidlist. The uidlist must be a single argument in the form of a blank- or comma-separated list.

-G gidlist -> List information for processes whose real group ID numbers are given in gidlist. The gidlist must be a single argument in the form of a blank- or comma-separated list.

Examples

praveen@praveen:~$ ps
PID   TTY   TIME   CMD
6874  pts/9   0:00     ksh
6877  pts/9   0:01     csh
418   pts/9   0:00     csh

With Regards,
S. Praveen

Commands

Day 93: $chsh command

Leave a comment Posted by Praveen Srinivasan on July 31, 2011

ODOC: About chsh command
Enables a user to change their login shell.

Syntax

chsh [-s login_shell] [user]

-s -> login_shell Enables a user to specify the login shell.

Examples

chsh

Used without the -s option enables the user to specify the path of their shell.

VALID SHELLS

chsh will accept the full pathname of any executable file on the system. However, it will issue a warning if the shell is not listed in the /etc/shells file. On the other hand, it can also be configured such that it will only accept shells listed in this file, unless you are root.

With Regards,
S. Praveen

Commands

Day 92: $stty command

Leave a comment Posted by Praveen Srinivasan on July 30, 2011

ODOC: About stty command
Sets options for your terminal.

Examples:

stty
typing stty alone on a dialup connection would list the information about the connection. Below is an example of what may be displayed.

praveen@praveen:~$ stty
speed 38400 baud; -parity
rows = 49; columns = 132; ypixels = 0; xpixels = 0;
erase = ^h; swtch = ;
brkint -inpck -istrip icrnl -ixany imaxbel onlcr tab3
echo echoe echok echoctl echoke iexten

With Regards,
S. Praveen

Commands

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One Day One Cmd

Invitation to connect on LinkedIn

Day 100:$ ip addr show

Day 99:$gpg filename.gpg command (Decrypt)

Day 98:$gpg -c command

Day 97: $ fdisk -v

Day 96: $ fdisk -l

Day 95: $ps -ef Command

Day 94: $ps Command

Day 93: $chsh command

Day 92: $stty command

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