How Can I Seamlessly Execute Bash Scripts from Go?

Executing Bash Scripts Seamlessly from Go

Executing a bash script from Golang can pose challenges using the standard os/exec method. To execute an entire sh file effectively, follow these steps:

For Direct Execution:

1. Prefix the script with #!/bin/sh (or #!/bin/bash).
2. Make the script executable using chmod x .

Using /bin/sh with Script Path:

• If you prefer not to make the script executable, invoke /bin/sh and provide the script path as an argument:

cmd := exec.Command("/bin/sh", mongoToCsvSH)

Example Script (assuming path and executable permissions set):

OIFS=$IFS;
IFS=",";

# fill in your details here
dbname=testDB
host=localhost:27017
collection=testCollection
exportTo=../csv/

# get comma separated list of keys. do this by peeking into the first document in the collection and get his set of keys
keys=`mongo "$host/$dbname" --eval "rs.slaveOk();var keys = []; for(var key in db.$collection.find().sort({_id: -1}).limit(1)[0]) { keys.push(key); }; keys;" --quiet`;
# now use mongoexport with the set of keys to export the collection to csv
mongoexport --host $host -d $dbname -c $collection --fields "$keys" --csv --out $exportTo$dbname.$collection.csv;

IFS=$OIFS;

Go Code:

var mongoToCsvSH string

func executeMongoToCsv() {
    out, err := exec.Command(mongoToCsvSH).Output()
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("output is %s\n", out)
}

Conclusion:

Following these steps, you can execute a bash script from Golang effectively, either directly or via /bin/sh.

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