feat: Replace shell execution with shell variable

dot_hooks.tmpl

@@ -1,6 +1,7 @@
+# shellcheck shell=sh
 # >>> conda initialize >>>
 # !! Contents within this block are managed by 'conda init' !!
-__conda_setup="$($HOME/miniconda3/bin/conda shell.$(basename $(readlink -f /proc/$$/exe)) 'hook' 2> /dev/null)"
+__conda_setup="$($HOME/miniconda3/bin/conda shell.$SH 'hook' 2> /dev/null)"
 if [ $? -eq 0 ]; then
     eval "$__conda_setup"
 else
@@ -18,7 +19,7 @@ fi
 # <<< conda initialize <<<
 
 {{- if lookPath "direnv" }}
-eval "$(direnv hook $(basename $(readlink -f /proc/$$/exe)))"
+eval "$(direnv hook $SH)"
 {{- end }}
 
 if [ -f $HOME/.ion/bin/ion ]; then
@@ -27,8 +28,8 @@ if [ -f $HOME/.ion/bin/ion ]; then
 fi
 
 # Import GNU parallel
-if [ $(command -v env_parallel.$(basename $(readlink -f /proc/$$/exe))) ]; then
-  source $(which env_parallel.$(basename $(readlink -f /proc/$$/exe)))
+if [ $(command -v env_parallel.$SH) ]; then
+  source $(which env_parallel.$SH)
 fi
 
 {{- if eq .machinetype "workstation" }}

executable_dot_bashrc.tmpl

@@ -1,5 +1,6 @@
 # shellcheck shell=bash
 # .bashrc
+export SH=bash
 
 if [ -f "$HOME/.modules" ]; then
   source $HOME/.modules

executable_dot_zshrc.tmpl

@@ -1,3 +1,4 @@
+export SH=zsh
 {{- if eq .chezmoi.os "linux" }}
 {{- if or
   (eq .machinetype "workstation")