Im in a intro to unix class and we have to create a a basic program to look up an argument in a large file.
when no argument is given he wants us to produce a error messgae, well this works but it also produces another error message because my variable now equals nothing.
Code:
#! /bin/bash
let num=$*
if [[ $num -gt 99 && $num -lt 1000 ]]
then
echo Area Codes for '"'$num'"':
grep "^$num" ~cs155/pub/area-codes | sed 's/^/ /'
elif [[ $num -lt 1 ]]
then
echo 'usage: ./area <query> ...' | grep usage
else
echo good night
fi
when ./area 303 is entered it works perfectly but when just ./area is entered i get this error
Code:
./area: line 2: let: num=: syntax error: operand expected (error token is "=")
usage: ./area <query> ...
the second line is my own error message which i want how do i get rid of the first?
Moderator's Comments:
Please use code tags
Last edited by Franklin52; 09-21-2010 at 03:34 AM..
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LEARN ABOUT OPENDARWIN
script
SCRIPT(1) BSD General Commands Manual SCRIPT(1)NAME
script -- make typescript of terminal session
SYNOPSIS
script [-a] [-k] [-q] [-t time] [file [command ...]]
DESCRIPTION
The script utility makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an
interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1).
If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript.
If the argument command ... is given, script will run the specified command with an optional argument vector instead of an interactive shell.
Options:
-a Append the output to file or typescript, retaining the prior contents.
-k Log keys sent to program as well as output.
-q Run in quiet mode, omit the start and stop status messages.
-t time Specify time interval between flushing script output file. A value of 0 causes script to flush for every character I/O event. The
default interval is 30 seconds.
The script ends when the forked shell (or command) exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if
ignoreeof is not set) for the C-shell, csh(1)).
Certain interactive commands, such as vi(1), create garbage in the typescript file. The script utility works best with commands that do not
manipulate the screen. The results are meant to emulate a hardcopy terminal, not an addressable one.
ENVIRONMENT
The following environment variable is utilized by script:
SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most
shells set this variable automatically).
SEE ALSO csh(1) (for the history mechanism).
HISTORY
The script command appeared in 3.0BSD.
BUGS
The script utility places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects.
It is not possible to specify a command without also naming the script file because of argument parsing compatibility issues.
When running in -k mode, echo cancelling is far from ideal. The slave terminal mode is checked for ECHO mode to check when to avoid manual
echo logging. This does not work when in a raw mode where the program being run is doing manual echo.
BSD June 6, 1993 BSD
09-21-2010
