How do you compare in shell?
Compare Numbers in Linux Shell Script
- num1 -eq num2 check if 1st number is equal to 2nd number.
- num1 -ge num2 checks if 1st number is greater than or equal to 2nd number.
- num1 -gt num2 checks if 1st number is greater than 2nd number.
- num1 -le num2 checks if 1st number is less than or equal to 2nd number.
How do I compare two words in a shell script?
Comparison Operators When comparing strings in Bash you can use the following operators: string1 = string2 and string1 == string2 – The equality operator returns true if the operands are equal. Use the = operator with the test [ command. Use the == operator with the [[ command for pattern matching.
How do you compare two variables in Unix?
$X = $Y is parsed as a shell command, meaning $X is interpreted as a command name (provided that the value of the variable is a single word). You can use the [ command (also available as test ) or the [[ … ]] special syntax to compare two variables.
How to write shell script to get the time difference?
Now I have .shtml file that is nothing but a shell script outputting some data to browser. What I want is time difference or time it took to execute a script. How do I write a shell script?
How to compare timestamp with current time stack?
This is my first journey into the realm of Unix scripting and I’m not sure how to go about this. Ill be querying a DB and pulling out a timestamp. What I need to do is take that timestamp (in the awesome format of YYYYMMDDHHMMSS) and if its more than 10 minutes old, return a 1 else return 0.
How to compare two datetime strings and return?
You could use date command to achieve this. man date will provide you with more details. A bash script could be something on these lines (seems to work fine on Ubuntu 10.04 bash 4.1.5):
Is there a script to read variables in Linux?
Note that this is a /bin/sh script, for the sake of portability, so it doesn’t take advantage of bash-isms you may be used to in Linux, in particular [ [ ]] and heretext to read variables. Oh, and I’m assuming that you meant “exit value” when you said “return value”.