file content as a command input on linux -


for example, have file a.txt content "123456" root's password. input command "su", displays "password: " prompt me input password.

how can regard file content (i.e. "123456") input of password?

thanks of you!

if command expects on command line, can use syntax like

ls -ll `cat file_list.txt`

but if want automate commands, maybe can consider give @ expect

in specific case, suppose better solution go expect, since su don't seems expect password command line argument


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