Solaris' pargs, penv, pfiles, pmap, pstack, and pwdx on macOS

Three weeks ago I posted Solaris' pargs, penv, pfiles, pmap, and pstack on GNU/Linux and since I am also a Mac user, I thought it could be a good idea to have those commands also on macOS. Here we go ...

function pargs()  { L=$(ps ww $1 | tail -1); echo ${L:27}; }

function penv()   { L=$(pargs $1); C=${#L}; L=$(ps wwe $1 | tail -1); L=${L:27}; echo ${L:$C} | tr ' ' '\n'; }

function pfiles() { lsof -p $1; }

function pmap()   { vmmap $1; }

function pstack() { echo "thread backtrace all" | lldb -p $1; }

function pwdx()   { L=$(lsof -a  -d cwd -p $1 | tail -1); echo /${L#*/}; }

Since there is no access to a proc file system on macOS (at least not by default), both pargs and penv call the ps command and pmap calls vmmap. Furthermore pwdx calls lsof with the current working directory descriptor request in order to get the required info. Since "ps wwe" returns not only the environment variables for the given process but also the program arguments on macOS, we need to strip the program arguments from the output. This has been done by calling pargs, determining the length of that output and cutting that length from the string again before we pass it to the tr command that gives us an environment variable for each line. For blog purposes I have shortened the variable names, L stands for line and C for count.

References:
http://wiki.bash-hackers.org/syntax/pe
http://yongsun.me/2009/01/tips-the-equivalents-of-ldd1-and-pmap1-on-mac-os-x/