[bash] Bash loop ping successful

You probably shouldn't rely on textual output of a command to decide this, especially when the ping command gives you a perfectly good return value:

The ping utility returns an exit status of zero if at least one response was heard from the specified host; a status of two if the transmission was successful but no responses were received; or another value from <sysexits.h> if an error occurred.

In other words, use something like:

((count = 100))                            # Maximum number to try.
while [[ $count -ne 0 ]] ; do
    ping -c 1 8.8.8.8                      # Try once.
    rc=$?
    if [[ $rc -eq 0 ]] ; then
        ((count = 1))                      # If okay, flag to exit loop.
    fi
    ((count = count - 1))                  # So we don't go forever.
done

if [[ $rc -eq 0 ]] ; then                  # Make final determination.
    echo `say The internet is back up.`
else
    echo `say Timeout.`
fi

Examples related to bash

Comparing a variable with a string python not working when redirecting from bash script Zipping a file in bash fails How do I prevent Conda from activating the base environment by default? Get first line of a shell command's output Fixing a systemd service 203/EXEC failure (no such file or directory) /bin/sh: apt-get: not found VSCode Change Default Terminal Run bash command on jenkins pipeline How to check if the docker engine and a docker container are running? How to switch Python versions in Terminal?

Examples related to shell

Comparing a variable with a string python not working when redirecting from bash script Get first line of a shell command's output How to run shell script file using nodejs? Run bash command on jenkins pipeline Way to create multiline comments in Bash? How to do multiline shell script in Ansible How to check if a file exists in a shell script How to check if an environment variable exists and get its value? Curl to return http status code along with the response docker entrypoint running bash script gets "permission denied"

Examples related to unix

Docker CE on RHEL - Requires: container-selinux >= 2.9 What does `set -x` do? How to find files modified in last x minutes (find -mmin does not work as expected) sudo: npm: command not found How to sort a file in-place How to read a .properties file which contains keys that have a period character using Shell script gpg decryption fails with no secret key error Loop through a comma-separated shell variable Best way to find os name and version in Unix/Linux platform Resource u'tokenizers/punkt/english.pickle' not found

Examples related to while-loop

While, Do While, For loops in Assembly Language (emu8086) MySQL Insert with While Loop Python loop to run for certain amount of seconds How to break a while loop from an if condition inside the while loop? How to find sum of several integers input by user using do/while, While statement or For statement Python: How to keep repeating a program until a specific input is obtained? Creating multiple objects with different names in a loop to store in an array list ORA-06502: PL/SQL: numeric or value error: character string buffer too small How to break out of a loop in Bash? for or while loop to do something n times

Examples related to ping

Docker - Ubuntu - bash: ping: command not found How to ping a server only once from within a batch file? Ping with timestamp on Windows CLI ping response "Request timed out." vs "Destination Host unreachable" Can't ping a local VM from the host Checking host availability by using ping in bash scripts Fastest way to ping a network range and return responsive hosts? Why can I ping a server but not connect via SSH? How to ping multiple servers and return IP address and Hostnames using batch script? Multiple ping script in Python