parent and child processes in command substitution

[kneielj]

How does the shell interpret command substitution ?
if its a normal command, the shell would spawn a child process and the parent would wait for the child to execute and would then collect its exit status.

if it is a backgroundproce ss, then the parent woul not wait on the child.

in similar context, how would command substitution be executed by the shell ?

[Motoma]

How does the shell interpret command substitution ?
if its a normal command, the shell would spawn a child process and the parent would wait for the child to execute and would then collect its exit status.

if it is a backgroundproce ss, then the parent woul not wait on the child.

in similar context, how would command substitution be executed by the shell ?

I am not quite sure what you mean by "command substitution." Could you please elaborate?

[kneielj]

I am not quite sure what you mean by "command substitution." Could you please elaborate?

by command substitution, i meant commands within the abck quote ` command`

eg. cut -d " " -f 1 `date`

[Motoma]

The stdout from the command is placed inline:

ls `echo $HOME`
The echo command will print the path of your home directory, and ls will take that result and give a directory listing (this is the same as ls $HOME)

grep -i motoma `find . -name "*.txt" -f`
Will return all of the regular files in the current directory that end in .txt and contain my name.