Thoxy
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WORK HISTORY Zane Company, St. Paul, MN 1998 - Present Subcontractor Mobile / Equipment Mechanic Union of Operating Engineers, Anytown, MN. Mobile Equipment Mechanic Doyle and Associates, St. Paul, MN Shop Mechanic Union of Operating Engineers, California Master Mechanic.

The Korn Shell Constructs UNIX Shell Programming QuickStart

Korn shell scripting if statement

VALID _PASSWORD "secret" #this is our password. echo "Please enter the password read PASSWORD if "PASSWORD " "VALID _PASSWORD " ; then echo "You have access!" else echo "ACCESS DENIED!" fi Remember that the spacing is very important in the. The following table shows the different expressions allowed. Comparisons: -eq equal to -ne not equal to -lt less than -le less than or equal to -gt greater than -ge greater than or equal to File Operations: -s file exists and. Unlike most other languages, spaces are very important when using an if statement. Let's do a simple script that will ask a user for a password before allowing him to continue. We introduced something else new in this script. On line 10 of the file, we see the code: AGEcat USERNAME _DAT This is how you execute a command and put the text output from the command into a variable. In this example, we will check for certain age ranges. If you are less than 20 or greater than 50, you are out of the age range. If you are between 20 and 30 you are in your 20's and. Echo AGE USERNAME _DAT fi fi fi Run this program a couple of times. First run it and give it the user name of "john". When it asks for an age, enter the age "1".

“This is obviously not how you would implement such security in a real system, but it will make a good example of using if and else statements. #!/bin/sh # This is some secure program that uses security.”
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aGEcat USERNAME _DAT <i>korn</i> echo "You <i>korn</i> <strong>statement</strong> are <em>statement</em> AGE years old!" <u>statement</u> <em>statement</em> else # Ask <u>shell</u> the <strong>korn</strong> <strong>statement</strong> user <i>scripting</i> for <i>scripting</i> his/her age <em>shell</em> echo "How <u>korn</u> old <strong>statement</strong> <u>scripting</u> are <strong>shell</strong> you?" read AGE if "AGE" -le. If <u>scripting</u> -s USERNAME _DAT ; then <u>scripting</u> # Read <em>statement</em> the age <strong>shell</strong> from the file. 4897

Now run the the script again with the name of "john enter the age 30. The script exits normally this time, the program created a file called "john_DAT" which contains the text "30".
we will <i>korn</i> <u>scripting</u> <strong>shell</strong> <strong>shell</strong> use <i>statement</i> it in an <em>shell</em> example below. This <em>korn</em> <i>korn</i> could be changed as <strong>korn</strong> <em>scripting</em> <u>korn</u> <em>statement</em> well by using elif <em>statement</em> (else <i>statement</i> if)). The structure <u>shell</u> of elif is the <u>korn</u> <u>scripting</u> same <em>scripting</em> as the <em>statement</em> structure <i>scripting</i> of if, 9496

UNIX Linux Shell Scripting Tutorial. If/Else In order for a script to be very useful, you will need to be able to test the conditions of variables. Most programming and scripting languages have some sort of if/else expression and so.

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Notice that it will say that you are too you and then exit. Now run the program again with the name "john" and the age 200. This time the script will tell you that you are too old and exit.
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