How to use a shell script to check whether a command had been installed in the Linux server All In One

errors ❌

shell script error [: ：需要整数表达式
shell script error [: -eq：需要一元表达式
shell script error [: ==：需要一元表达式

#!/usr/bin/env bash

if [[ $(command -v nvm) == nvm ]]; then
  echo "❌ nvm not exist, trying to re-install it ... ⏳"
else
 echo "nvm had  been installed ✅"
fi

#!/usr/bin/env bash

temp=$(command -v nvm)
echo $temp

# if [[ $temp -eq nvm ]]; then
if [ $temp == nvm ]; then
  echo "❌ nvm not exist, trying to re-install it ... ⏳"
else
 echo "nvm had  been installed ✅"
fi

echo finished 

标签：profile,use,shell,script,--,echo,usr,nvm,root	

From： https://www.cnblogs.com/xgqfrms/p/17721396.html