UNIX for Dummies Questions & Answers

#!/bin/sh
# Create something like your file.
> /tmp/extract.sh
chmod 755 /tmp/extract.sh
echo "#!/bin/sh" >> /tmp/extract.sh
echo "ENVIR=bin" >> /tmp/extract.sh
echo "CMND=ear" >> /tmp/extract.sh
echo "/\$ENVIR/cl\$CMND" >> /tmp/extract.sh
# Done!

# Get an array of the file using newlines for IFS...
array=($(cat /tmp/extract.sh))
# eval "${array[0]}"
# Get first variable and value...
eval "${array[1]}"
# Get second variable and value...
eval "${array[2]}"
# Now create a new variable called 'command_string'...
eval command_string="${array[3]}"

# Print these to the terminal window...
echo $ENVIR
echo $CMND
echo "$command_string"

# Now use '/' as the IFS...
ifs_str="$IFS"
IFS="/"
# Re-use 'array' for this demo...
array=($command_string)
mycommand="${array[1]}"
echo "$mycommand"
mycommand="${array[2]}"
echo "$mycommand"
# Reset IFS...
IFS="$ifs_str"
# Now execute the genuine clear command
/usr/bin/$mycommand
echo "DONE! Now scroll up your terminal window to see the results..."
# Done!

Last login: Thu Dec 12 20:45:58 on ttys000
AMIGA:barrywalker~> chmod 755 variable.sh
AMIGA:barrywalker~> ./variable.sh
bin
ear
/bin/clear
bin
clear
















DONE! Now scroll up your terminal window to see the results...
AMIGA:barrywalker~> _