I have a very long line in my .bash_profile, as below:
export DYLD_FALLBACK_LIBRARY_PATH=/usr/local/cuda/lib:$HOME/anaconda2/lib:/usr/local/lib:/usr/lib:/opt/intel/compilers_and_libraries/mac/lib:/opt/intel/mkl/lib:$DYLD_FALLBACK_LIBRARY_PATH
How do I break this line into multiple lines?
Also, is .bash_profile considered a shell script? If not, what exactly is it categorized as? If I know this, I will be able to look up general formatting guide for this file.
DYLD_FALLBACK_LIBRARY_PATH="/opt/intel/mkl/lib:$DYLD_FALLBACK_LIBRARY_PATH"
DYLD_FALLBACK_LIBRARY_PATH="/opt/intel/compilers_and_libraries/mac/lib:$DYLD_FALLBACK_LIBRARY_PATH"
DYLD_FALLBACK_LIBRARY_PATH="/usr/local/lib:/usr/lib:$DYLD_FALLBACK_LIBRARY_PATH"
DYLD_FALLBACK_LIBRARY_PATH="/usr/local/cuda/lib:$HOME/anaconda2/lib:$DYLD_FALLBACK_LIBRARY_PATH"
export DYLD_FALLBACK_LIBRARY_PATH
Or, with an array and string concatenation:
paths=(
/usr/local/cuda/lib
"$HOME/anaconda2/lib"
/usr/local/lib
/usr/lib
/opt/intel/compilers_and_libraries/mac/lib
/opt/intel/mkl/lib
${DYLD_FALLBACK_LIBRARY_PATH:+"$DYLD_FALLBACK_LIBRARY_PATH"}
)
oldIFS="$IFS"; IFS=:
export DYLD_FALLBACK_LIBRARY_PATH="${paths[*]}"
IFS="$oldIFS"; unset oldIFS
That last item in the array will expand to the value of the DYLD_FALLBACK_LIBRARY_PATH variable, or to nothing if it's not set or is empty.
The expansion of "${paths[*]}" will be the paths joined into a single string delimited by the first character of the IFS variable.
You can do this using the line break character: \. Also you should declare and export on two different lines so:
DYLD_FALLBACK_LIBRARY_PATH=/usr/local/cuda/lib:\
$HOME/anaconda2/lib:\
/usr/local/lib:/usr/lib:\
/opt/intel/compilers_and_libraries/mac/lib:\
/opt/intel/mkl/lib:\
$DYLD_FALLBACK_LIBRARY_PATH
export DYLD_FALLBACK_LIBRARY_PATH
Your bash profile is a config file and a script of sorts.
$ sign before the DYLD_FALLBACK_LIBRARY_PATH variable at the end of the declaration?
– Ben
Jul 27 '18 at 13:02
Since it's Bash, you can append to a string (var+=value). Though you pretty much need a temporary variable here, since you're prefixing the paths to the original value.
tmp=/usr/local/cuda/lib
tmp+=:$HOME/anaconda2/lib
tmp+=:/usr/local/lib
tmp+=:/usr/lib
tmp+=:/opt/intel/compilers_and_libraries/mac/lib
tmp+=:/opt/intel/mkl/lib
export DYLD_FALLBACK_LIBRARY_PATH=$tmp:$DYLD_FALLBACK_LIBRARY_PATH
unset tmp
Note that like your original snippet, this assumes that DYLD_FALLBACK_LIBRARY_PATH is not empty in the beginning. If it is, this'd leave a trailing : in it.
Alternatively, if your paths don't contain whitespace just put the string in quotes, and remove the whitespace afterwards:
export DYLD_FALLBACK_LIBRARY_PATH="/usr/local/cuda/lib:
$HOME/anaconda2/lib:
/usr/local/lib:/usr/lib:
/opt/intel/compilers_and_libraries/mac/lib:
/opt/intel/mkl/lib:
$DYLD_FALLBACK_LIBRARY_PATH"
DYLD_FALLBACK_LIBRARY_PATH=${DYLD_FALLBACK_LIBRARY_PATH//[[:space:]]}
This is a bit silly:
prepend() { declare -n _n=$1; _n="$2$_n"; }
prepend DYLD_FALLBACK_LIBRARY_PATH /opt/intel/mkl/lib:
prepend DYLD_FALLBACK_LIBRARY_PATH /opt/intel/compilers_and_libraries/mac/lib:
prepend DYLD_FALLBACK_LIBRARY_PATH /usr/lib:
prepend DYLD_FALLBACK_LIBRARY_PATH /usr/local/lib:
prepend DYLD_FALLBACK_LIBRARY_PATH "$HOME/anaconda2/lib:"
prepend DYLD_FALLBACK_LIBRARY_PATH /usr/local/cuda/lib:
export DYLD_FALLBACK_LIBRARY_PATH
$to make it$DYLD_FALLBACK_LIBRARY_PATH? – Jeff Schaller♦ Jul 25 '18 at 19:31