How do display error messages instantly when command fails?

Question Posted / franklin

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How do display error messages instantly when command fails?..

Answer / rallapalli

HE did not ask how to redirect error of a command. He said
clearly. How do you display error message instantly when
command fails.

ans:
By default it will display no need to do any thing. when u
type wrong command the error will display on screen.
Ex:
#usradd tom
ERR: command not found

ok?

Is This Answer Correct ?

7 Yes

0 No

How do display error messages instantly when command fails?..

Answer / ajit mohan b

Suppose you are trying to cat a non existing file:

cat /etc/shado 2>/dev/null || echo “Failed to open file”

command 2 "echo" is executed only if command 1 "cat" returns
a non-zero exit status

# cat /etc/shado 2>/dev/null || echo "Failed to open file"
Failed to open file
#

Is This Answer Correct ?

6 Yes

2 No

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