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edited Mar 31, 2017 at 17:06

This is my script, test.sh


if ssh myhost true; then
  echo 1
fi
echo 2

if ssh myhost true; then
  echo 1
fi
echo 2

p.s. I have setup ssh key for myhost, so it won't ask password.

If I run it via bash, it will output two lines


$ bash test.sh
1
2

$ bash test.sh
1
2

However, if I redirect the script to bash's stdin, it only output one line

$ bash < test.sh
1

Why do bash behave differently? Is this a bug of bash or a magic feature?

I have tried bash 4.3 and 4.4.

p.s. If replacing "ssh myhost true" by "true"I replace ssh myhost true with true, the script canwill always output two lines.

This is my script, test.sh


if ssh myhost true; then
  echo 1
fi
echo 2

p.s. I have setup ssh key for myhost, so it won't ask password.

If I run it via bash, it will output two lines


$ bash test.sh
1
2

However, if I redirect the script to bash's stdin, it only output one line

$ bash < test.sh
1

Why do bash behave differently? Is this a bug of bash or a magic feature?

I have tried bash 4.3 and 4.4.

p.s. If replacing "ssh myhost true" by "true", the script can always output two lines.

This is my script, test.sh

if ssh myhost true; then
  echo 1
fi
echo 2

p.s. I have setup ssh key for myhost, so it won't ask password.

If I run it via bash, it will output two lines

$ bash test.sh
1
2

However, if I redirect the script to bash's stdin, it only output one line

$ bash < test.sh
1

Why do bash behave differently? Is this a bug of bash or a magic feature?

I have tried bash 4.3 and 4.4.

p.s. If I replace ssh myhost true with true, the script will always output two lines.

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asked Mar 31, 2017 at 17:04

kcwu

why do bash behave differently for script from stdin?

This is my script, test.sh


if ssh myhost true; then
  echo 1
fi
echo 2

p.s. I have setup ssh key for myhost, so it won't ask password.

If I run it via bash, it will output two lines


$ bash test.sh
1
2

However, if I redirect the script to bash's stdin, it only output one line

$ bash < test.sh
1

Why do bash behave differently? Is this a bug of bash or a magic feature?

I have tried bash 4.3 and 4.4.

p.s. If replacing "ssh myhost true" by "true", the script can always output two lines.

bash ssh