Basic Unix commands-3

11. uname command

Syntax: uname [options]

Description:    Used to print system Information

-s    prints the kernel name
-n    print the network node hostname
-r    prints the kernel release
-v    print the kernel version
-m    prints the machine hardware name
-o    prints the operating system
tkanu025@hp:~$ uname
Linux
tkanu025@hp:~$ uname -s
Linux
tkanu025@hp:~$ uname -n
hp
tkanu025@hp:~$ uname -r
4.4.0-18362-Microsoft
tkanu025@hp:~$ uname -v
#1049-Microsoft Thu Aug 14 12:01:00 PST 2020
tkanu025@hp:~$ uname -m
x86_64
tkanu025@hp:~$ uname -o
GNU/Linux
tkanu025@hp:~$
view raw uname hosted with ❤ by GitHub

12. bc command

It is used for command line calculator. It is similar to basic calculator.

Syntax: bc [option]

bc starts by processing code from all the files listed on the command line in the order listed. After processing all the files bc reads from the standard input. Code is executed as it is read.

-q    To avoid bc welcome message
-l    To include math library functionalities
quit    to quit the calculator.

tkanu025@hp:~$ bc
bc 1.07.1
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006, 2008, 2012-2017 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'.
10+50
60
quit
tkanu025@hp:~$ bc -q
80+20
100
80*50
4000
quit
tkanu025@hp:~$ bc -l
bc 1.07.1
Copyright 1991-1994, 1997, 1998, 2000, 2004, 2006, 2008, 2012-2017 Free Software Foundation, Inc.
This is free software with ABSOLUTELY NO WARRANTY.
For details type `warranty'.
840*566+100
475540
quit
tkanu025@hp:~$
view raw bc.sh hosted with ❤ by GitHub

13. tty Command

prints the file name of the terminal connected to standard input. It writes the name of the terminal that is connected to standard input onto standard output.
It does not require any additional argument

Syntax: tty

tkanu025@hp:~$ tty
/dev/tty1
tkanu025@hp:~$
view raw tty hosted with ❤ by GitHub

14. stty command

It sets certain terminal I/O modes for the device that is the current standard input. Without arguments, it writes the settings of certain modes to standard output.

Syntax: stty

tkanu025@hp:~$ stty
speed 38400 baud; line = 0;
eol = M-^?; eol2 = M-^?; swtch = M-^?;
ixany iutf8
tkanu025@hp:~$
view raw stty.sh hosted with ❤ by GitHub

15. cat Command

Main functions of cat commands are

  1. to create new files
  2. Display the contents of an existing file
  3. Concatenate the content of multiple files and display it.

syntax: cat [options] [file name]

Options

-b    add line numbers to non blank lines
-e    displays a $ (dollar character) at the end of each line
-n    add line numbers to all lines
-s    removes all the blank lines and replace it to single line.
-t    show ^I instead of tabs.

#creating new file
cat > file-name.txt

Above syntax creates test.txt file and allow us to insert content in this file.
After inserting content you can use clt+d to exit the file.
If file with same name exist then it will overwrite that file.
tkanu025@hp:~$ cat > test.txt
Hello world
this is a test file
tkanu025@hp:~$ cat -n test.txt
1 Hello world
2 this is a test file
3
tkanu025@hp:~$ cat -e test.txt
Hello world$
this is a test file$
$
tkanu025@hp:~$
view raw cat-create hosted with ❤ by GitHub
Combining two text files

cat test.txt file.txt

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