Say, I have a file foo.txt specifying N arguments
arg1
arg2
...
argN
which I need to pass to the command my_command
How do I use the lines of a file as arguments of a command?
If your shell is bash (amongst others), a shortcut for $(cat afile) is $(< afile), so you'd write:
mycommand "$(< file.txt)"
Documented in the bash man page in the 'Command Substitution' section.
Alterately, have your command read from stdin, so: mycommand < file.txt
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