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I am developing a script. This script takes in one parameter which is the name of a file whose content is a list of names of some files. The script can check whether those files exist in current...

I have a script named check which will read the content of a file and check wether those files exist in the current directory. If so it will have the exit status of 0, otherwise it will have 1....

Wow, that's excellent! Now I understand the differences. But, how should I modify my program to get the standard input from input.in?

program file contains:
echo $2 $1
input.in file contains:
a b

When doing:
./program < input.in > output.out
The output.out was empty
However, when doing:
./program `cat input.in` >...

I am sorry, I can't understand why ./program < input.in > output.out redirects the outputs to stderr? And I also tried the following code:
./program `cat input.in` > output.out
This time, it works...

'program' is the name of the script I want to run. The parameters of this script is in the input.in file. After running that script, the results are dumped into output.out file.

I want to use a content of a file as standard input to a program and dump the output to a file. However, when I try the following code:
./program < input.in > output.out
The output.out is empty....

Excellent! Thank you so much!

Can I understand the code in the way that the first star (*) in */*.c refers to all the direct subdirectories in the current directory?
Thanks!

I want to list files that end with .c in the direct subdirectory of the current directory. I have tried the following command:
find ./ -mindepth 2 -maxdepth 2 -name "*.c"
Is that right? Or is there...

It seems it works perfectly fine. Can I understand the code in this way that [!A]?* filters those files not start with A, however, have at least two characters and A[!B]* catches those files start...

I want to retrieve files whose names have at least two characters but do not start with 'AB'. The command : ls [!A][!B]* just list files that do not start with 'AB', thus, file AC will not appear in...

I am new to UNIX Shell. I want to list the files names in the current directory that are not start with 'AB' and have at least two characters. For example, say I have those files in the current...