Question

In: Computer Science

List all files and directories in the current directory and store in a variable called malf....

List all files and directories in the current directory and store in a variable called malf.

Count how many lines end with your firstname in the file /etc/conf

Explain this command: mv pmu*.[ab] cces/

Quick help in 5 min pleases with the UNIX program!
I want only the final answer

Expert Solution

Please let me know if you need more information:-

======================================
List all files and directories :===> ls
List all files and directories including hidden files and directories ===> ls -a

Example:-

===================

ss139t@ss139t:~$ ls
As2_sbah DownVote.sh FSUTIL ipv6_verify.py 'new 8.py' q105 Q49.py Q5.sh q78 root_fil2 run_cmd.py sri srinu2 total.pl
createfile findDir.sh guess.cpp Module3 pdf_file.py Q2.sh Q4.sh q70 Q8.sh root_file shellScriptFunction.sh srinu ssr
ss139t@ss139t:~$ malf=`ls`
ss139t@ss139t:~$ echo $malf
As2_sbah createfile DownVote.sh findDir.sh FSUTIL guess.cpp ipv6_verify.py Module3 new 8.py pdf_file.py q105 Q2.sh Q49.py Q4.sh Q5.sh q70 q78 Q8.sh root_fil2 root_file run_cmd.py shellScriptFunction.sh sri srinu srinu2 ssr total.pl
ss139t@ss139t:~$
==============
Including hidden files:-

==============

ss139t@ss139t:~$ malf=`ls -a`
ss139t@ss139t:~$ echo $malf
. .. As2_sbah .bash_history .bash_logout .bashrc .cache createfile DownVote.sh findDir.sh FSUTIL .gnupg guess.cpp ipv6_verify.py .lesshst .local Module3 new 8.py pdf_file.py .profile .python_history q105 Q2.sh Q49.py Q4.sh Q5.sh q70 q78 Q8.sh root_fil2 root_file run_cmd.py .selected_editor shellScriptFunction.sh sri srinu srinu2 .ssh ssr .sudo_as_admin_successful total.pl .viminfo
ss139t@ss139t:~$

==============

Count how many lines end with your firstname in the file /etc/conf
=====
grep -w "firstname$" /etc/conf |wc -l

==

root@ss139t:/etc# cat /etc/conf
1how are you firstname
2 firstname dhshjjds
3djfjsdfhshf
4jsfskf firstname
5fdjsjfs firstname
6jfjsjnfs
7fsfs
8fsfsfsgfsg
9gsagfsgfsag firstname
root@ss139t:/etc# grep -w "firstname$" /etc/conf
1how are you firstname
4jsfskf firstname
5fdjsjfs firstname
9gsagfsgfsag firstname
root@ss139t:/etc# grep -w "firstname$" /etc/conf |wc -l
4
root@ss139t:/etc#
===

==

Explain this command: mv pmu*.[ab] cces/

==

mv ==> move command

you need to under here is starting with ==> pmu
and then fillowed by anything ==> * (star)
and then follow by dot must be present ==> . (dot)
and then must be with extension with letter a or b ==> [ab]
cces/ ==> this to to directory

See the below example
===

ss139t@ss139t:~/test$ ls -l
total 40
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:53 cces
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:50 pmua
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:50 pmub
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:50 pmud
-rw-rw-r-- 1 ss139t ss139t 0 Mar 30 10:53 pmujdj.a
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:53 pmujdj.afd
-rw-rw-r-- 1 ss139t ss139t 0 Mar 30 10:53 pmujdj.b
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:53 pmujdj.bfhs
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:51 pmujdj.hd
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:51 pmujdj.s
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:51 pmujdj.z
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:50 pmuz
ss139t@ss139t:~/test$ ls -l cces
total 0
ss139t@ss139t:~/test$ mv pmu*.[ab] cces/
ss139t@ss139t:~/test$ ls -l
total 40
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:54 cces
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:50 pmua
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:50 pmub
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:50 pmud
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:53 pmujdj.afd
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:53 pmujdj.bfhs
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:51 pmujdj.hd
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:51 pmujdj.s
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:51 pmujdj.z
drwxrwxr-x 2 ss139t ss139t 4096 Mar 30 10:50 pmuz
ss139t@ss139t:~/test$ ls -l cces
total 0
-rw-rw-r-- 1 ss139t ss139t 0 Mar 30 10:53 pmujdj.a
-rw-rw-r-- 1 ss139t ss139t 0 Mar 30 10:53 pmujdj.b
ss139t@ss139t:~/test$

==

Please let me know if you need more information.

====

Thanks

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