linux - BASH: Check if user is root -

how can check whether user root or not within bash script?

i know can use

[[ $uid -eq 0 ]] || echo "not root" 

or

[[ $euid -eq 0 ]] || echo "not root" 

but if script invoked via fakeroot, uid , euid both 0 (of course, fakeroot fakes root privileges).

but there way check whether user root? without trying root can (i.e. creating file in /)?

thank you,

fabian

fakeroot sets custom ld_library_path contains paths libfakeroot. example:

/usr/lib/x86_64-linux-gnu/libfakeroot:/usr/lib64/libfakeroot:/usr/lib32/libfakeroot 

you can use detect if application running inside fakeroot iterating paths , looking libfakeroot.

sample code:

is_fakeroot=false  path in ${ld_library_path//:/ };         if [[ "$path" == *libfakeroot ]];                 is_fakeroot=true                 break         fi done  echo "$is_fakeroot"