Bash Wizards - How to execute a Option within a Menu Display Script

LinuxRSA · 06-20-2023, 04:32 AM

Hi Bash Wizards.

Im creating a bash clean up script that performs housekeeping on disks ( Ubuntu )

I have a list of OS / APP one liners that performs cleanups.

I have written the below bash scripts to be executed as root user.

1. Display the File System.

Code:

#!/bin/bash
##Disk Clean up script

MOUNT=$(mount|egrep -iw "ext4|ext3|xfs|gfs|gfs2|btrfs"|sort -u -t' ' -k1,2)
FS_USAGE=$(df -PTh|egrep -iw "ext4|ext3|xfs|gfs|gfs2|btrfs"|sort -k6n|awk '!seen[$1]++')
IUSAGE=$(df -PThi|egrep -iw "ext4|ext3|xfs|gfs|gfs2|btrfs"|sort -k6n|awk '!seen[$1]++')

#--------Check for any read-only file systems--------#
echo -e "\nChecking For Read-only File System[s]"
echo -e "$D"
echo "$MOUNT"|grep -w \(ro\) && echo -e "\n.....Read Only file system[s] found"|| echo -e ".....No read-only file system[s] found. "

#--------Check for currently mounted file systems--------#
echo -e "\n\nChecking For Currently Mounted File System[s]"
echo -e "$D$D"
echo "$MOUNT"|column -t

#--------Check disk usage on all mounted file systems--------#
echo -e "\n\nChecking For Disk Usage On Mounted File System[s]"
echo -e "$D$D"
echo -e "( 0-79% = OK/HEALTHY, 80-89% = WARNING, 90-100% = CRITICAL )"
echo -e "$D$D"
echo -e "Mounted File System[s] Utilization (Percentage Used):\n"

echo "$FS_USAGE"|awk '{print $1 " "$7}' > /tmp/s1.out
echo "$FS_USAGE"|awk '{print $6}'|sed -e 's/%//g' > /tmp/s2.out
> /tmp/s3.out

for i in $(cat /tmp/s2.out);
do
{
  if [ $i -ge 90 ];
   then
     echo -e $i"% ------------------Critical" >> /tmp/s3.out;
   elif [[ $i -ge 80 && $i -lt 89 ]];
   then
     echo -e $i"% ------------------Warning" >> /tmp/s3.out;
   else
     echo -e $i"% ------------------Healthy" >> /tmp/s3.out;
  fi
}
done
paste -d"\t" /tmp/s1.out /tmp/s3.out|column -t

This is the Output:

Code:

root@disk-app-01:/home/housekeeping# ./diskdisplay.sh

Checking For Read-only File System[s]

.....No read-only file system[s] found.


Checking For Currently Mounted File System[s]

/dev/sda1  on  /     type  ext4  (rw,relatime,discard,data=ordered)
/dev/sdb1  on  /mnt  type  ext4  (rw,relatime,data=ordered)


Checking For Disk Usage On Mounted File System[s]

( 0-79% = OK/HEALTHY, 80-89% = WARNING, 90-100% = CRITICAL )

Mounted File System[s] Utilization (Percentage Used):

/dev/sdb1  /mnt  1%   ------------------Healthy
/dev/sda1  /     77%  ------------------Healthy
root@disk-app-01:/home/housekeeping#

I have created the below Menu script:

Code:

#!/bin/bash
echo
   echo \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*
   echo -e '\033[1mWelcome to the Disk Clean up Shop\033[0m'
   echo \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* 
echo 
echo "#Select The Disk Operation Option"
echo
echo "  1) Display Disk Information"
echo
echo "  2) Clear OS Related Files"
echo
echo "  3) Clear Space on APP Nodes"
echo
echo "  4) Clear Space on Ingress Nodes" 
echo
echo "  5) Exit" 

read n
case $n in
  1) echo "You chose Option 1";;
  2) echo "You chose Option 2";;
  3) echo "You chose Option 3";;
  4) echo "You chose Option 4";;
  5) echo "You chose Option 5";;
  *) echo "invalid option";;
esac

This is the output:

Code:

root@disk-app-01:/home/housekeeping#  ./menudisplay.sh

******************************************
Welcome to the Disk Clean up Shop
******************************************

#Select The Disk Operation Option

  1) Display Disk Information

  2) Clear OS Related Files

  3) Clear Space on APP Nodes

  4) Clear Space on Ingress Nodes

  5) Exit

Question 1: How do i do i run the ./menudisplay.sh and select option 1) Display Disk Information by pressing 1.

Question 2: Can one add other options for clean up and return to main menu ?

Thanks

michaelk · 06-20-2023, 05:07 AM

You should be able to find lots of examples of how to create a bash menu and how to use the case statement.
The basic syntax of a case statement is:

Code:

case expression in
 pattern 1) # each pattern and the following statements are called a clause
    statements
;; #separates clauses
 pattern 2)
   statements
;;
...
esac

You can add your specific commands to run for each clause or put them in a function to be called.

Put the menu inside a continuous loop that runs until you exit. You can add matching patterns as desired.

bash also has a built in select command for menus.

shruggy · 06-20-2023, 09:27 AM

Quote:

Originally Posted by LinuxRSA

Question 1: How do i do i run the ./menudisplay.sh and select option 1) Display Disk Information by pressing 1.

Sorry, I don't quite understand your first question. Doesn't your script already do this?

GazL · 06-20-2023, 09:54 AM

I think he's asking "how do I select option one by only pressing '1'". If so, the answer is use read -rN1

I'm not sure what he's asking in Q2, as the answer is obviously "Yes, one can."

LinuxRSA · 06-20-2023, 09:55 AM

Quote:

Originally Posted by shruggy

Sorry, I don't quite understand your first question. Doesn't your script already does this?

I have two scripts:

1 - A bash script to display disk info - ./diskdisplay.sh
2 - A bash script that creates a menu - ./menudisplay.sh

I want to be able to run the menu script then press 1 which Displays Disk Information the output of ./diskdisplay.sh and display it.

So... I want one script.

This is the code, I just don't know how to make it work

Code:

#!/bin/bash
##Disk Clean up script

echo
   echo \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*
   echo -e '\033[1mWelcome to the Disk Clean up Shop\033[0m'
   echo \*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\*\* 
echo 
echo "#Select The Disk Operation Option"
echo
echo "  1) Display Disk Information"
echo
echo "  2) Clear OS Related Files"
echo
echo "  3) Clear Space on APP Node"
echo
echo "  4) Clear Space on Ingress Node" 
echo
echo "  5) Exit" 

read n
case $n in
  1) echo "Displaying Disk Information";;
  2) echo "Clearing OS Related Files";;
  3) echo "Clearing Space on APP Nodes";;
  4) echo "Clear Space on Ingress Nodes";;
  5) echo "Exiting Disk Clean up Script - Goodbye";;
  *) echo "invalid option";;
esac   


##Displaying Disk Information

MOUNT=$(mount|egrep -iw "ext4|ext3|xfs|gfs|gfs2|btrfs"|sort -u -t' ' -k1,2)
FS_USAGE=$(df -PTh|egrep -iw "ext4|ext3|xfs|gfs|gfs2|btrfs"|sort -k6n|awk '!seen[$1]++')
IUSAGE=$(df -PThi|egrep -iw "ext4|ext3|xfs|gfs|gfs2|btrfs"|sort -k6n|awk '!seen[$1]++')

#--------Check for any read-only file systems--------#
echo -e "\nChecking For Read-only File System[s]"
echo -e "$D"
echo "$MOUNT"|grep -w \(ro\) && echo -e "\n.....Read Only file system[s] found"|| echo -e ".....No read-only file system[s] found. "

#--------Check for currently mounted file systems--------#
echo -e "\n\nChecking For Currently Mounted File System[s]"
echo -e "$D$D"
echo "$MOUNT"|column -t

#--------Check disk usage on all mounted file systems--------#
echo -e "\n\nChecking For Disk Usage On Mounted File System[s]"
echo -e "$D$D"
echo -e "( 0-79% = OK/HEALTHY, 80-89% = WARNING, 90-100% = CRITICAL )"
echo -e "$D$D"
echo -e "Mounted File System[s] Utilization (Percentage Used):\n"

echo "$FS_USAGE"|awk '{print $1 " "$7}' > /tmp/s1.out
echo "$FS_USAGE"|awk '{print $6}'|sed -e 's/%//g' > /tmp/s2.out
> /tmp/s3.out

for i in $(cat /tmp/s2.out);
do
{
  if [ $i -ge 90 ];
   then
     echo -e $i"% ------------------Critical" >> /tmp/s3.out;
   elif [[ $i -ge 80 && $i -lt 89 ]];
   then
     echo -e $i"% ------------------Warning" >> /tmp/s3.out;
   else
     echo -e $i"% ------------------Healthy" >> /tmp/s3.out;
  fi
}
done

shruggy · 06-20-2023, 10:59 AM

michaelk answered this in #2. Do you need examples? ABS has some. Or, as Bash Guide for Beginners suggests, have a look inside /etc/init.d. Even on a systemd-based system there are quite a few initscripts, and most of them make use of case statements.

teckk · 06-20-2023, 11:28 AM

General idea.

Code:

#!/usr/bin/bash

PS3="
Select an option. : "

options=('Displaying Disk Information'
        'Clearing OS Related Files'
        'Clearing Space on APP Nodes'
        'Clear Space on Ingress Nodes'
        'Exiting Disk Clean up Script - Goodbye'
        'invalid option'
        'Exit')

while :; do
    clear
    select opt in "${options[@]}"; do
        case "$opt" in
            "${options[0]}") echo "You entered - "$opt"" ;;
            
            "${options[1]}") echo "You entered - "$opt"" ;;
            
            "${options[2]}") echo "You entered - "$opt"" ;;
            
            "${options[3]}") echo "You entered - "$opt"" ;;
            
            "${options[4]}") echo "You entered - "$opt"" ;;
            
            "${options[5]}") echo "You entered - "$opt"" ;;
            
            "${options[6]}") echo "Bye"; exit ;;
        esac
        sleep 2
        break
    done
done

LinuxRSA · 06-21-2023, 04:56 AM

Quote:

Originally Posted by teckk

General idea.

Code:

#!/usr/bin/bash

PS3="
Select an option. : "

options=('Displaying Disk Information'
        'Clearing OS Related Files'
        'Clearing Space on APP Nodes'
        'Clear Space on Ingress Nodes'
        'Exiting Disk Clean up Script - Goodbye'
        'invalid option'
        'Exit')

while :; do
    clear
    select opt in "${options[@]}"; do
        case "$opt" in
            "${options[0]}") echo "You entered - "$opt"" ;;
            
            "${options[1]}") echo "You entered - "$opt"" ;;
            
            "${options[2]}") echo "You entered - "$opt"" ;;
            
            "${options[3]}") echo "You entered - "$opt"" ;;
            
            "${options[4]}") echo "You entered - "$opt"" ;;
            
            "${options[5]}") echo "You entered - "$opt"" ;;
            
            "${options[6]}") echo "Bye"; exit ;;
        esac
        sleep 2
        break
    done
done

This works nicely

This is my output when i run the menudisplay script.

Code:

1) Display Disk Information      4) Clear Space on Ingress Nodes
2) Clear OS Related Files        5) Exit
3) Clear Space on APP Nodes

Select an option. :

Question: where do i insert the code to display the disk information ?

Do i insert it between "${options[0]}") echo "You entered - "$opt"" ;;

pan64 · 06-21-2023, 05:08 AM

Quote:

Originally Posted by LinuxRSA

Question: where do i insert the code to display the disk information ?

Do i insert it between "${options[0]}") echo "You entered - "$opt"" ;;

Why don't you try it yourself?

LinuxRSA · 06-21-2023, 05:43 AM

Quote:

Originally Posted by pan64

Why don't you try it yourself?

Managed to get the display sorted.

Code:

#!/bin/bash

MOUNT=$(mount|egrep -iw "ext4|ext3|xfs|gfs|gfs2|btrfs"|sort -u -t' ' -k1,2)
FS_USAGE=$(df -PTh|egrep -iw "ext4|ext3|xfs|gfs|gfs2|btrfs"|sort -k6n|awk '!seen[$1]++')
IUSAGE=$(df -PThi|egrep -iw "ext4|ext3|xfs|gfs|gfs2|btrfs"|sort -k6n|awk '!seen[$1]++')

PS3="
Select an option. : "
options=('Display Disk Information'
        'Clear OS Related Files'
        'Clear Space on APP Nodes'
        'Clear Space on Ingress Nodes'
        'Exit')

while :; do
    clear
    select opt in "${options[@]}"; do
        case "$opt" in
            "${options[0]}") echo "You entered - "$opt""  ; #--------Check for any read-only file systems--------#
echo -e "\nChecking For Read-only File System[s]"
echo -e "$D"
echo "$MOUNT"|grep -w \(ro\) && echo -e "\n.....Read Only file system[s] found"|| echo -e ".....No read-only file system[s] found. "

#--------Check for currently mounted file systems--------#
echo -e "\n\nChecking For Currently Mounted File System[s]"
echo -e "$D$D"
echo "$MOUNT"|column -t

#--------Check disk usage on all mounted file systems--------#
echo -e "\n\nChecking For Disk Usage On Mounted File System[s]"
echo -e "$D$D"
echo -e "( 0-79% = OK/HEALTHY, 80-89% = WARNING, 90-100% = CRITICAL )"
echo -e "$D$D"
echo -e "Mounted File System[s] Utilization (Percentage Used):\n"

echo "$FS_USAGE"|awk '{print $1 " "$7}' > /tmp/s1.out
echo "$FS_USAGE"|awk '{print $6}'|sed -e 's/%//g' > /tmp/s2.out
> /tmp/s3.out

for i in $(cat /tmp/s2.out);
do
{
  if [ $i -ge 90 ];
   then
     echo -e $i"% ------------------Critical" >> /tmp/s3.out;
   elif [[ $i -ge 80 && $i -lt 89 ]];
   then
     echo -e $i"% ------------------Warning" >> /tmp/s3.out;
   else
     echo -e $i"% ------------------Healthy" >> /tmp/s3.out;
  fi
}
done
paste -d"\t" /tmp/s1.out /tmp/s3.out|column -t ;;

            "${options[1]}") echo "You entered - "$opt"" ;;

            "${options[2]}") echo "You entered - "$opt"" ;;

            "${options[3]}") echo "You entered - "$opt"" ;;

            "${options[4]}") echo "Exiting Disk Clean up Script - Goodbye"; exit ;;
        esac
        sleep 5
        break
    done
done

Output is as follows:

Code:

1) Display Disk Information      4) Clear Space on Ingress Nodes
2) Clear OS Related Files        5) Exit
3) Clear Space on APP Nodes

Select an option. : 1
You entered - Display Disk Information

Checking For Read-only File System[s]

.....No read-only file system[s] found.


Checking For Currently Mounted File System[s]

/dev/sda1  on  /     type  ext4  (rw,relatime,discard,data=ordered)
/dev/sdb1  on  /mnt  type  ext4  (rw,relatime,data=ordered)


Checking For Disk Usage On Mounted File System[s]

( 0-79% = OK/HEALTHY, 80-89% = WARNING, 90-100% = CRITICAL )

Mounted File System[s] Utilization (Percentage Used):

/dev/sdb1  /mnt  1%   ------------------Healthy
/dev/sda1  /     77%  ------------------Healthy

It displays this output for about 5-6 seconds then returns to the main menu.

How does one bypass the returning to main menu and perhaps insert a go back / return to main menu option.

michaelk · 06-21-2023, 05:44 AM

Code:

while :; do
    clear
    select opt in "${options[@]}"; do
        case "$opt" in
            "${options[0]}") 
               ## Disk Information code goes here.
             ;;
            
            "${options[1]}") 
             ## Clear OS Related Files code goes here.
            ;;
            
            "${options[2]}") 
              ##   Clear Space on APP Node code here
             ;;
            
            "${options[3]}") 
               ## Clear Space on Ingress Nodes code here
             ;;
            
            "${options[4]}") 
               ## exit code goes here i.e.
               exit
            ;;
            
            *) 
              echo "Invalid option $REPLY"
            ;;
        
       esac
    done
done

As posted before you can place each code block in a function and call that function from the case statement.

create a submenu or maybe a press any key wait prompt etc.

LinuxRSA · 06-21-2023, 06:51 AM

Quote:

Originally Posted by michaelk

Code:

while :; do
    clear
    select opt in "${options[@]}"; do
        case "$opt" in
            "${options[0]}") 
               ## Disk Information code goes here.
             ;;
            
            "${options[1]}") 
             ## Clear OS Related Files code goes here.
            ;;
            
            "${options[2]}") 
              ##   Clear Space on APP Node code here
             ;;
            
            "${options[3]}") 
               ## Clear Space on Ingress Nodes code here
             ;;
            
            "${options[4]}") 
               ## exit code goes here i.e.
               exit
            ;;
            
            *) 
              echo "Invalid option $REPLY"
            ;;
        
       esac
    done
done

As posted before you can place each code block in a function and call that function from the case statement.

create a submenu or maybe a press any key wait prompt etc.

Life Saver!!! Thank you @michaelk
Script is now running flawlessly.

Now to make it look nice

michaelk · 06-21-2023, 07:14 AM

Code:

while :; do
    clear
    select opt in "${options[@]}"; do
...

I was not paying enough attention to teckk's code but there is a clear command that is causing your "problems".