ar – create, modify, and extract from archives

The archiver, also known simply as ar, is a Unix utility that maintains groups of files as a
single archive file. Today, ar is generally used only to create and update static library files
that the link editor or linker uses and for generating .deb packages for the Debian family; it
can be used to create archives for any purpose, but has been largely replaced by tar for
purposes other than static libraries.[3] An implementation of ar is included as one of the GNU

$ar artest.a artest.txt
ar: two different operation options specified
$ar r artest.a artest.txt
ar: creating artest.a
$file artest.a
artest.a: current ar archive
$cat artest.a
artest.txt/ 0 0 0 644 36 `;
$cat artest.txt;


Single quotes in the shell session are used to hide certain things in wordpress post
They are not part of the real content.


Colossians 3:23-24

23 Whatever you do, do from the heart, as for the Lord and not for others,
24 knowing that you will receive from the Lord the due payment of the inheritance; be slaves of the Lord Christ. 

1 PETER 4:8

8 Above all, let your love for one another be intense, because love covers a multitude of sins.

HEBREW 5:8-9

8 Son though he was, he learned obedience from what he suffered;
9 and when he was made perfect, he became the source of eternal salvation for all who obey him,

Fundamental related of a bash builtin command named “if”


Conditionals have many forms. The most basic form is: if expression then statement where
'statement' is only executed if 'expression' evaluates to true. '21' evaluates to true.xs

$if true; then echo "works" ; fi
$if false; then echo "works" ; fi


Fundamental of a bash builtin command named “unalias”

ABOUT unalias

Remove each name from the list of defined aliases.  If -a is supplied, all alias definitions
are removed.  The return  value  is true unless a supplied name is not a defined alias.

unalias: usage: unalias [-a] name [name …]
$echo $?
$unalias -a
$echo $?
$unalias pwd
bash: unalias: pwd: not found
$alias ls list
bash: alias: ls: not found
bash: alias: list: not found
$alias list ls
bash: alias: list: not found
bash: alias: ls: not found
$alias pwd pwf
bash: alias: pwd: not found
bash: alias: pwf: not found
$alias list="ls"
$unalias list
$echo $?
bash: list: command not found