I've put together a simple bash script to see if rbenv is installed. I installed rbenv system-wide instead of per-user using this guide and confirmed it's installed for both users:
user@ubuntu:~$ rbenv version
2.1.4 (set by /usr/local/rbenv/version)
user@ubuntu:~$ sudo -i
root@ubuntu:~$ rbenv version
2.1.4 (set by /usr/local/rbenv/version)
I have to check if it is installed for the root user because I am doing system admin jobs within the script:
#!/bin/bash
exec 5> debug_output.txt
BASH_XTRACEFD="5"
[ $UID != 0 ] && exec sudo $0 "$@"
if [[ ! `rbenv version | grep "2.1.4"` ]]; then
echo "rbenv not installed ... do something"
else
echo "rbenv installed"
fi
However, when I run the script for the normal user context (using sudo):
user@aaabbbccc:~$ sudo ./test.sh
./test.sh: line 5: rbenv: command not found
rbenv not installed ... do something
Why is my script not picking up the context for the root user and detecting that rbenv is actually installed?
Update: added Debug output
+ '[' 0 '!=' 0 ']'
++ grep 2.1.4
++ rbenv version
+ [[ ! -n '' ]]
+ echo 'rbenv not installed'
/usr/local/ (or wherever rbenv executable is installed) is not in your user's executable path when sudo runs. Use -i or add /usr/local/ to your $PATH.