Here I wanna demonstrate to you guys simple scripting.
Actually scripting is just like command line with several command inside the file which is if you run/execute the file will run the command inside the file. But it's more than that because you can add if else statement inside the file.
first you can create your files with .sh is usualy to initiate that this is an bash script files. but actualy script also will be run with out .sh extention
sysadmin@localhost:~$ touch report.sh
Then see the files is alread created with standard permission files you can also read about permission in my previous post here : http://andre-networking.blogspot.com/2013/01/linux-file-permissions.html
sysadmin@localhost:~$ ls -l
total 44
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Desktop
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Documents
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Downloads
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Music
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Pictures
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Public
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Templates
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Videos
drwxr-xr-x 1 sysadmin sysadmin 4096 Dec 16 19:06 junk_folder
-rw-rw-r-- 1 sysadmin sysadmin 0 May 16 14:20 report.sh
Then we can use nano or any other text editor that you comfy to use
sysadmin@localhost:~$ nano report.sh
put the script inside text editor
#!/bin/bash
echo "This is document report to administrator regarding disk usage" > laporan.txt
date >> laporan.txt
pwd >> laporan.txt
df -h >> laporan.txt
echo "==========================================" >> laporan.txt
you can see there is #!/bin/bash on the first line. It's to indicate that this is an bash file. but actualy the script will also running without this line. Every bash script is begin with this line called shebang or hasbang. This is an interpreter
That script will resulting date, current directory, and disk usage and put it all into laporan.txt. Pay attention to > and >> . >is to overwrite all inside the file. while >> is to append to end of line.
Give permission to user
sysadmin@localhost:~$ chmod u+x report.sh
and see the permission is already changed to executable
sysadmin@localhost:~$ ls -l
total 52
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Desktop
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Documents
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Downloads
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Music
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Pictures
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Public
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Templates
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Videos
drwxr-xr-x 1 sysadmin sysadmin 4096 Dec 16 19:06 junk_folder
-rwxrw-r-- 1 sysadmin sysadmin 221 May 16 14:22 report.sh
Then try to run the bash
sysadmin@localhost:~$ ./report.sh
The script will earn new files called laporan.txt
sysadmin@localhost:~$ ls -l
total 52
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Desktop
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Documents
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Downloads
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Music
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Pictures
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Public
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Templates
drwxr-xr-x 1 sysadmin sysadmin 4096 May 2 2019 Videos
drwxr-xr-x 1 sysadmin sysadmin 4096 Dec 16 19:06 junk_folder
-rw-rw-r-- 1 sysadmin sysadmin 580 May 16 14:22 laporan.txt
-rwxrw-r-- 1 sysadmin sysadmin 221 May 16 14:22 report.sh
Then see what is inside the laporan.txt
sysadmin@localhost:~$ cat laporan.txt
This is document report to administrator regarding disk usage
Sat May 16 14:22:39 UTC 2020
/home/sysadmin
Filesystem Size Used Avail Use% Mounted on
overlay 196G 155G 32G 84% /
tmpfs 64M 0 64M 0% /dev
tmpfs 95G 0 95G 0% /sys/fs/cgroup
/dev/sda1 196G 155G 32G 84% /etc/hosts
shm 64M 0 64M 0% /dev/shm
tmpfs 95G 0 95G 0% /proc/acpi
tmpfs 95G 0 95G 0% /proc/scsi
tmpfs 95G 0 95G 0% /sys/firmware
==========================================
Here we go!!!
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