GoLang SSH Commands with slashes seem to instantly fail - go

Question

I'm currently writing an app that given a parameter, will run a command on a remote server. I'm using the /x/crypto/ssh package, everything seems to go smoothly if I use one liner commands like "who" or "ls", however, if I run a more complex command such as:
"grep SOMEDATA /var/log/logfile.log"
the program immediately exits and the command execution line with nothing more than "process exited with status 1", and I don't get anything else back.
If I check the history of the user I'm having it SSH into the remote system as, I do not see the command running at all.
Has anyone else run into this type of issue before? Here's a snippet of the code I'm using to execute this (sensitive data removed of course):
func returnData(w http.ResponseWriter, r *http.Request) {
var b bytes.Buffer
hostKey, err := getHostKey("SERVERNAME")
if err != nil {
log.Fatalln(err)
}
err = r.ParseForm()
if err != nil {
log.Fatalln(err)
}
config := &ssh.ClientConfig{
User: "USERNAME",
Auth: []ssh.AuthMethod{
ssh.Password("TESTPASS"),
},
HostKeyCallback: ssh.FixedHostKey(hostKey),
}
client, err := ssh.Dial("tcp", "SERVERNAME:22", config)
if err != nil {
log.Fatalln("Creating Client Failed: ", err)
}
session, err := client.NewSession()
if err != nil {
log.Fatalln("Creating new Session Failed: ", err)
}
session.Stdout = &b
inputData := r.Form["fname"][0]
cmdExecute := fmt.Sprintf(`sudo grep %v /var/log/logfile.log`, inputData)
log.Println(cmdExecute)
if err := session.Run(cmdExecute); err != nil {
log.Fatalln("Getting Data From session Failed: ", err)
log.Fatalln(b.String())
}
//log.Println(hostKey)
defer session.Close()