How would I validate that a program exists, in a way that will either return an error and exit, or continue with the script?
It seems like it should be easy, but it's been stumping me.
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How can I check if a program exists from a Bash script?
Started by
veera004
, Jun 15 2023 05:55 AM
2 replies to this topic
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#2
SleepyDude
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Posted 15 June 2023 - 06:19 AM
Sorry you are looking for Bash not Batch!
Edited by SleepyDude, 17 June 2023 - 09:38 AM.
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Rui
#3
pSYCHOtRAIL
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Posted 16 June 2023 - 05:48 PM
How would I validate that a program exists, in a way that will either return an error and exit, or continue with the script?
It seems like it should be easy, but it's been stumping me.
# here are several tests because some packages need different approaches. these are all written for use in BASH scripts. you can see a hodgepodge of tests below so you can pick which works best for several different types of packages.
## ## ## ## ## ## ## ## ## ##
# this first section works in well over 90% of cases for me.
hit="insert-package-name-here" # a test to see if $hit is installed and if not, install it with permission in another script, assuming user has sudo rights. "${hit}" retains the package-name for every instance below.
command -v "${hit}"
Status=$?
{
if [ "${Status}" -ne "0" ]; then
hit2="" # paste a good package description between the " marks
x-terminal-emulator -e "${HOME}/Bash_Scripts/install_package.sh" "${hit}" "${hit2} "${hit3}" "${hit4}" # I have a script named install_package.sh that handles the installation. this passes the package name and a good description, may need to pass more variables at times: "${hit}" "${hit2}""${hit3}" "${hit4}" I have the installation script file set up to handle as needed.
fi
}
## ## ## ## ## ## ## ## ## ##
apt-get install "${hit}" # go ahead and install the package if that suits your case
## ## ## ## ## ## ## ## ## ##
# alternate forms without installing:
command -v "${hit}" >/dev/null 2>&1 || { echo "I require ${hit} but it's not installed. Aborting." >&2; exit 1; }
## ## ## ## ## ## ## ## ## ##
dpkg-query -s "${hit}" >/dev/null 2>&1 # returns 0 if installed, 1 if not
## ## ## ## ## ## ## ## ## ##
dpkg-query -W -f='${Status}' "${hit}" | grep -q " installed" # returns 0 if installed
## ## ## ## ## ## ## ## ## ##
if which "${hit}" >/dev/null; then
echo "${hit} is installed on your system"
else
echo "${hit} is not installed on your system"
fi
## ## ## ## ## ## ## ## ## ##
if type "${hit}" >/dev/null 2>&1; then
echo "${hit} is installed on your system"
else
echo "${hit} is not installed on your system"
fi
## ## ## ## ## ## ## ## ## ##
if dpkg -s "${hit}" >/dev/null 2>&1; then
echo "${hit} is installed on your system"
else
echo "${hit} is not installed on your system"
fi
## ## ## ## ## ## ## ## ## ##
I forgot, never run a script or a command until you understand what it is and what it does. Some nasty people will deliberately give you something that could trash your system for meanness.
Edited by pSYCHOtRAIL, 16 June 2023 - 05:51 PM.
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