Using golang variable in bash script Command

[PK]

HI everyone, can anyone help me with this:
I want to list all the files having some user's entered string as substring in their name.
So I wrote these commands:

scanner := bufio.NewScanner(os.Stdin)
fmt.Println("Enter the substring name")
scanner.Scan()
search:=scanner.Text()
cmd1,err:=exec.Command("bash", "-c", "find . -name '*$search*'")

But I think the variable search is not getting used inside exec command.

Can anyone please let me know, how I can use the golang variable in bash command this?

Thanks

[Jan Mercl]

On Mon, Sep 19, 2022 at 11:50 AM PK <princ...@gmail.com> wrote:

> search:=scanner.Text()
> cmd1,err:=exec.Command("bash", "-c", "find . -name '*$search*'")

Try something like this, not tested:

        cmd, err := exec.Command("bash", "-c", fmt.Sprintf("find . -name %s", search))

[PK]

then we don't need to add these commands 

scanner := bufio.NewScanner(os.Stdin)
fmt.Println("Enter the substring name")
scanner.Scan()
search:=scanner.Text()

 right???

we only need to keep this one

 cmd, err := exec.Command("bash", "-c", fmt.Sprintf("find . -name %s", search))

[Brian Candler]

On Monday, 19 September 2022 at 10:50:36 UTC+1 princ...@gmail.com wrote:

search:=scanner.Text()
cmd1,err:=exec.Command("bash", "-c", "find . -name '*$search*'")

You first "search" is a go local variable.

Your second "$search" is seen by the shell as a reference to an environment variable.

So if you want to do it that way, you need to set it in the environment, e.g. with os.Setenv.

https://pkg.go.dev/os#Setenv

[Amnon]

What happens if the user enters the string "'; rm -fr ~;'" ?

[Jan Mercl]

On Mon, Sep 19, 2022 at 2:52 PM Amnon <amn...@gmail.com> wrote:

> What happens if the user enters the string "'; rm -fr ~;'" ?

https://twitter.com/codepo8/status/1373224835866882048

[Tamás Gulácsi]

No, please, no!

Do NOT use bash with string interpolation if possible!

Call find directly:

cmd, err := exec.Command("find", ".", "-name", search)

[TECHAX]

Thank you for the response.

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[Robert Solomon]

I've done this for Linux and windows, as I regularly use both.  But I used a different strategy.  I used the os functions to retrieve a slice of strings that I can then filter and sort as I desire.  And I use the command line to get the target string.

github.com/drrob1/src/dsrt

also in that repo is ds and rex that do this. dsrtr and dsrtre search all subdirectories down from the current dir for what you describe.

And I also sort the returned list by time w/ the most recent first.

--rob solomon

[Rich]

I do a lot of 'scripting' like things with Go - I found that using github.com/bitfield/script makes it a TON easier to run commands and you can pipe a command into another command, etc. Worth checking it out.