Contents
Load constants from a configuration file
To load constants in a properties file:
| source REPLACE_FILE_PATH |
Alternatively:
| . REPLACE_FILE_PATH |
The config file will look like this:
| export constant_name_1=”value 1″ export constant_name_2=”value 2″ export constant_name_3=”${constant_name_1}${constant_name_2}” |
Check input parameters
Check minimum number of parameters
| if [ “$#” -lt “2” ]
then echo “Usage: $0 param_name_1 param_name_2″ exit 1 else … fi |
Check first parameter is empty
| if [[ -z $1 ]] then print Usage: “$NAME” param_name exit fi |
Loops
Fixed number of iterations
| for repository_id in {1..7} do echo $repository_id done |
Iterate over all the elements of an array
| for element_id in ${elements[@]} do echo $element_id done |
Iterate over all the files/folder in the current folder
| for file in * do echo $file done |
Iterate over all the results of a request
| results=$(curl -k …)for result in $results do echo ${result} done |
Using dynamic variable names
When we have to get the value of a variable whose name is generated automatically we can use: “!”
| for index_id in {1..7} do variable_name=”name_prefix${index_id}” echo “Value: ${!variable_name}” … done |
Common issues
Error assigning variables
Check there are no blank spaces between the variable name, the “=” symbol and the value
Comparison not working as expected
If it always returns true check the spaces around the comparison symbol