Shell variables¶

Display of all shell variables¶

[1]:

!set

…
HOME=/Users/veit
…
PATH=/Users/veit/Library/Caches/uv/archive-v0/8SR6iAPFDtNw2pfP04l3g/bin:/Users/veit/cusy/trn/Python4DataScience/.venv/bin:/Users/veit/sandbox/py313/.venv/bin:/opt/homebrew/opt/ruby/bin:/Users/veit/.cargo/bin:/Users/veit/spack/bin:/opt/homebrew/opt/ruby/bin:/opt/homebrew//lib/ruby/gems/3.3.0/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Library/Apple/usr/bin:/usr/local/MacGPG2/bin:/Library/TeX/texbin
…

Showing the value of a variable¶

[2]:

!echo $HOME

/Users/veit

The `path` variable¶

It defines the shell’s search path, i.e., the list of directories that the shell looks in for runnable programs.

[3]:

!echo $PATH

/Users/veit/Library/Caches/uv/archive-v0/8SR6iAPFDtNw2pfP04l3g/bin:/Users/veit/cusy/trn/Python4DataScience/.venv/bin:/Users/veit/sandbox/py313/.venv/bin:/opt/homebrew/opt/ruby/bin:/Users/veit/.cargo/bin:/Users/veit/spack/bin:/opt/homebrew/opt/ruby/bin:/opt/homebrew//lib/ruby/gems/3.3.0/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/System/Cryptexes/App/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin:/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin:/Library/Apple/usr/bin:/usr/local/MacGPG2/bin:/Library/TeX/texbin

Creating and changing variables¶

Creating or overwriting variables¶

[4]:

!export SPACK_ROOT=~/spack

Append additional specifications¶

[5]:

!export PATH=/usr/local/opt/python@3.13/bin:$PATH