shell - Get current directory and concatenate a path -


this shell script (.sh file). need create absolute path based on current directory. know pwd, how concatenate string? here example of trying do:

"$pwd/some/path"

sounds want:

path="$(pwd)/some/path"

the $( opens subshell (and ) closes it) contents executed script outputs put in location in string.

more useful getting directory of script running:

dot="$(cd "$(dirname "$0")"; pwd)" path="$dot/some/path"

that's more useful because resolves same path no matter when run script:

> pwd ~ > ./my_project/my_script.sh ~/my_project/some/path

rather than:

> pwd ~ > ./my_project/my_script.sh ~/some/path > cd my_project > pwd ~/my_project > ./my_script.sh ~/my_project/some/path

more complex if need directory of current script running if has been executed through symlink (common when installing scripts through homebrew example) need parse , follow symlink:

if [[ "$ostype" == *darwin* ]];   readlink_cmd='greadlink' else   readlink_cmd='readlink' fi  dot="$(cd "$(dirname "$([ -l "$0" ] && $readlink_cmd -f "$0" || echo "$0")")"; pwd)"

more complex , more requirements work (e.g. having gnu compatible readlink installed) tend not use much. when i'm need it, installing command through homebrew.


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