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Shell Programming and Scripting

time command

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# 8  
Old 02-24-2009
can u tell me y
[user@localhost ~]$time cat new\ file > /dev/null

works

and
[user@localhost ~]$time cat new\ file 2> /dev/null

it doesnt work ...as we can c frm the 1st post.

for the 2nd one we have to use

[user@localhost ~]${ time cat new\ file ; } 2> /dev/null

then it works
y??
# 9  
Old 02-24-2009
Because time, in your example, is probably the bash builtin. Test the difference between
Code:
$ time cat new\ file 2>/dev/null

and
Code:
$ /usr/bin/time cat new\ file 2>/dev/null

# 10  
Old 02-24-2009
Quote:
Originally Posted by suhaas
can u tell me y

Please see the The UNIX and Linux Forums - Forum Rules: "don't write in cyberchat or cyberpunk style"
Quote:
[user@localhost ~]$time cat new\ file > /dev/null

works

and
[user@localhost ~]$time cat new\ file 2> /dev/null

it doesnt work ...as we can c frm the 1st post.

for the 2nd one we have to use

[user@localhost ~]${ time cat new\ file ; } 2> /dev/null

then it works
y??

Case 1:
Code:
time cat new\ file 2> /dev/null

The time command runs the command line:
Code:
cat new\ file 2> /dev/null

Its stderr is sent to /dev/null; stderr for time is not redirected.

Case 2:
Code:
{ time cat new\ file; } 2> /dev/null

The output of the compound command, including time, is sent to /dev/null.
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