Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Exercise
Exercise 4: Repeat the example scripts, and run
them.
• Exercise 5: Write script that take two arguments,
and output the every number between from arg1 to
arg2.
expand button
Transcribed Image Text:Exercise Exercise 4: Repeat the example scripts, and run them. • Exercise 5: Write script that take two arguments, and output the every number between from arg1 to arg2.
shift
• shift is a shell builtin that operates on the positional parameters. Each time you
invoke shift, it "shifts" all the positional parameters down by one. $2 becomes
$1, $3 becomes $2, $4 becomes $3, and so on. Try this:
#!/bin/bash
echo "You start with $# positional parameters"
# Loop until all parameters are used up
while [ "$1" != "" 1; do
echo "Parameter 1 equals $1"
echo "You now have $# positional parameters"
# Shift all the parameters down by one
shift
done
expand button
Transcribed Image Text:shift • shift is a shell builtin that operates on the positional parameters. Each time you invoke shift, it "shifts" all the positional parameters down by one. $2 becomes $1, $3 becomes $2, $4 becomes $3, and so on. Try this: #!/bin/bash echo "You start with $# positional parameters" # Loop until all parameters are used up while [ "$1" != "" 1; do echo "Parameter 1 equals $1" echo "You now have $# positional parameters" # Shift all the parameters down by one shift done
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