mkbin

#!/bin/bash

# behaves depending on the script original name
# if 'cx' then adds x-bit to a file
# if 'mkbin' picks up a file, copies it to ~/bin and adds
# x-bit, also makes sure ~/bin exists and ti is in the PATH

# The first touch:
# $ bash shell_scripts/mkbin shell_scripts/mkbin
# $ cd ~/bin && ln mkbin cx

# Copyright (C) 2016 ivan.tervanto /at/ aalto.fi

# Released under the GNU General Public License


if ! [[ $# -eq 1 && -r $1 ]]; then
  echo "The file does not exist or not readable or file name is missing"
  echo "Usage: ${0##*/} filename"
  exit 1
fi

# file can be any, 'filename' or '../dir/filename' etc
file=$1
dbin=$HOME/bin

# we expect either mkbin or cx as a script name
case "$0" in
 *mkbin)
   # create ~/bin if does not exist yet
   [[ -d $dbin ]] || mkdir $dbin
   # add it to $PATH if not yet there
   [[ "$PATH" =~ $dbin ]] || PATH+=:$dbin
   # copy the file in there and reassigne $file
   # (can be replaced with ln if on the same filesystem)
   cp "$file" $dbin && file="$dbin/${file##*/}"
   ;&
 *cx)
   # +x bit is set in both cases mkbin/cx
   chmod +x $file
   ;;
  *)
   echo "$0: filename unrecognized"
   exit 1
   ;;
esac

# header check/warning
[[ "$(head -n 1 $file)" =~ '#!/bin/bash' ]] || \
  echo 'Warning: #!/bin/bash header is missing'