CODEWITHSUNDEEP
linuxshell
Ben
Ben

Reputation: 139

Running program and providing input from shell script

I have a shell script as follows

ln -s -f /ctf/message/dave.inbox /home/alice/imoprt.inbox
/ctf/message/sendmsg
echo hello

The purpose of the script is to first make a link, then run a program, and provide hello as input to the program. It all works except providing hello as the input. I can do this easily by writing a script just like

echo hello

but then I am unable to do some other things, such as linking before. Is there a way to do this sequence of commands?

Upvotes: 0

Views: 2156

Answers (1)

William Pursell
William Pursell

Reputation: 212248

There are a few common ways to provide input to a command:

echo input | cmd

{ echo one; echo two; echo three; } | cmd

cmd <<EOF
line 1 of input 
line 2 of input
EOF

trap 'rm -f fifo' 0
mkfifo fifo
cmd < fifo &
{
echo line 1 of input
var=$( echo line 2 of input generated dynamically )
echo "$var"
echo another line of input
} > fifo
wait

Upvotes: 2

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