I write a shell script named as test.sh :
#!/bin/bash
read MY_NAME
echo $MY_NAME
When i execute by file, such as:
./test.sh
everything is ok, but if i execute it by string ,such as:
cat ./test.sh | sh
there is nothing output. Read command did not work when I Execute command using string. How can i fixed it ?
So, if i want execute the script with string and read some value from the stdin, how to work ?
When you execute the script by a shell running in a pipeline, the stdin of the shell is connected to the pipe, so read reads from the pipe, but there's nothing, as everything has already been read by the shell (or worse, if the script is long enough, read might eat part of it before the shell reads it).
BTW, don't run bash scripts with sh, on many systems, sh and bash aren't identical.
sh might not read the entire script, allowing the read command (when executed) to consume a line of the script.sh and bash are identical, bash will behave differently when invoked as sh.