Shell Scripting - Shell Scripting Commands

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Shell Scripting Commands

In shell scripting How to indentify that the previous command was run successfully?

Total Answers and Comments: 6

Last Update: September 18, 2009 Asked by: siddhishah_999

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Best Rated Answer

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Submitted by: dominic_pc1

echo $?

if the output of command is 0 than succesfully executed
if the output is non -zero than not successfully executed.

Above answer was rated as good by the following members:
amitkshirsagar, Goriparthi

May 02, 2009 05:48:35

garima2k1

Member Since: May 2009 Contribution: 1

RE: Shell Scripting Commands

If a command is executed successfully then the exit status of a command is 0. We can test whether a command is execute successfully or not by writing 2 line

[ command_name ] # command_name is any unix command
echo $?

# $? contains success/failure of the last command that has been executed

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May 06, 2009 11:46:06

dominic_pc1

Member Since: May 2009 Contribution: 1

RE: Shell Scripting Commands

echo $?

if the output of command is 0 than succesfully executed
if the output is non -zero than not successfully executed.

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2 0

Overall Rating: +2

May 27, 2009 12:29:54

bhaileem

Member Since: May 2009 Contribution: 2

RE: Shell Scripting Commands

S? to check whether to check the previous statement was executed successfully.
To display use echo command.

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June 11, 2009 10:11:13

khadsesunil

Member Since: September 2008 Contribution: 1

RE: Shell Scripting Commands

as per my knowledge if any person executing any command on unix prompt definately either it will the output or syntax error.If you are executing any script and you want to check the whether it completed successfully or not.Then execute the script in debugging mode.
If anybody have a better answer then please forward me on khadsesunil@gmail.com

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June 18, 2009 10:21:34

sanjayojha02

Member Since: April 2009 Contribution: 3

RE: Shell Scripting Commands

If you want to check that your script has successfully ran. For this you have to do error handling for each command by displaying echo $?

"?" is a inbuilt variable in Shell Scripting the value for this is assinged by shell after execution of any command to zero(success) or non-zero(failure).

so check this after each command. If somewhere it throws the unexpected values than do error handling there.

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September 18, 2009 08:20:12

kamalesh_greek

Member Since: September 2009 Contribution: 2

RE: Shell Scripting Commands

Using echo $?

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