Sams Teach Yourself Shell Programming in 24 Hours, Second Edition

Hour 17

1:	Using the for statement, write an awk script that prints each of the fields in a record in reverse order.
A1:	A possible implementation is as follows: #!/bin/sh if [ $# -lt 1 ] ; then echo "USAGE: `basename $0` files" exit 1 fi awk '{ for (i=NF;i>=1;i--) { printf("%s ",$i) ; } printf("\n") ; }' $@
2:	Write an awk script that balances a checking account. Your program needs to print the balance in the account every time the user makes a transaction. The transactions are stored in a file. Each line or record in the file has the following format: command:date:comment:amount Here date is the date on which the transaction was made, comment is a string (including embedded spaces) describing the transaction, and amount is the amount of the ...