[SOLVED] Is there A Way To Echo Or Display What Is Being Executed In The Command Terminal

redhatwannabe · 10-20-2015, 02:49 AM

Dear all,

currently in the command prompt, I need to execute a long list of commands

Code:

grid@node1:~/rac/troubleshoot_scan_name> ping -c 3 cluster-scan

grid@node1:~/rac/troubleshoot_scan_name> ping -c 3 node1-vip

grid@node1:~/rac/troubleshoot_scan_name> ping -c 3 node2-vip
..........

this is what I want to achieve,

write a bash script to execute the a list of command below, which can be done. However how do I include, echo or display the prompt, grid@node1:~/rac/troubleshoot_scan_name> naturally?

currently inside my bash script

Code:

export CURRENT_DIRECTORY="$(/bin/pwd)"
export REPLACEMENT="~"
export PROMPT_END="${CURRENT_DIRECTORY/${HOME}/${REPLACEMENT}}"
export PROMPT="${CURRENT_USER}@${HOSTNAME}:${PROMPT_END}> "

printf "\n${PROMPT}ping -c 3 cluster-scan\n"
ping -c 3 cluster-scan

While the above code achieve the above, it is quite error prone. What if whatever display does not reflect what actually happen?

for example

Code:

printf "\n${PROMPT}ping -c 3 cluster-scan\n"
ping -c 3 node1-vip

many thanks in advance!

NevemTeve · 10-20-2015, 03:09 AM

What's the point in echoing the prompt again and again?
What do you really want to achieve?

You want a script that executes these commands and generates a log that proves you have executed these commands manually?

Edit: If you only want to see the commands the script executes, use the following:

Code:

set -x
for i in node1-vip node2-vip; do
    ping -c 3 "$i"
done

redhatwannabe · 10-20-2015, 03:24 AM

You want a script that executes these commands and generates a log that proves you have executed these commands manually?

Yes I want a script that executes these commands and generates a log that proves you have executed these commands manually?

That will also means including the prompt "grid@node1~/rac/troubleshoot_scan_name> "

Many thanks in advance!

NevemTeve · 10-20-2015, 03:45 AM

Code:

#!/bin/sh
echo "This output wasn't generated by a script I promise"

cat <<DONE |
ls -ld .
id -a
echo other commands you executed manually
DONE
while read line; do
    printf '%s@%s:%s$ %s\n' "$USER" "$(hostname)" "$(pwd)" "$line"
    eval "$line"
done

redhatwannabe · 10-21-2015, 01:22 AM

Hi NevemTeve, thanks for your solution:

My final solution is as follow:

Code:

export HOSTNAME="$(/bin/hostname)"
export CURRENT_DIRECTORY="$(/bin/pwd)"
export REPLACEMENT="~"
export PROMPT_END="${CURRENT_DIRECTORY/${HOME}/${REPLACEMENT}}"
export PROMPT="${CURRENT_USER}@${HOSTNAME}:${PROMPT_END}> "

cat <<DONE |
ls -lrt
--list of command
DONE
while read line; do
        printf '%s%s\n' "${PROMPT}${line}"
        eval "${line}"
done

again my solution is not really perfect as from http://linuxconfig.org/bash-prompt-basics, the linux prompt can be changed, once changed, the code also need be modified accordingly

thanks a lot!