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Powershell equivalent of Perl's $CHILD_ERROR
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Data science time! April 2019 and salary with experience
Should we burninate the [wrap] tag?
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I essentially require a functionality in Powershell that executes the given string (it can be a CMD/Powershell command, a perl/python/powershell with arguments or an exe with arguments, etc) captures its exit value.
In perl I would pass the string to 'system()' and use the '$CHILD_ERROR' perlval and shift it to access the exit code.
In powershell I am clueless.
I tried using Invoke-Expression, but even if the expression passed to Invoke-Expression fails, the Invoke-Expression call itself will have succeeded.
windows powershell perl exit exit-code
edited Mar 8 at 16:14
choroba
160k14142211
asked Mar 8 at 16:03
MRUDUL DOSHITMRUDUL DOSHIT
283
add a comment |
I essentially require a functionality in Powershell that executes the given string (it can be a CMD/Powershell command, a perl/python/powershell with arguments or an exe with arguments, etc) captures its exit value.
In perl I would pass the string to 'system()' and use the '$CHILD_ERROR' perlval and shift it to access the exit code.
In powershell I am clueless.
I tried using Invoke-Expression, but even if the expression passed to Invoke-Expression fails, the Invoke-Expression call itself will have succeeded.
windows powershell perl exit exit-code
edited Mar 8 at 16:14
choroba
160k14142211
asked Mar 8 at 16:03
MRUDUL DOSHITMRUDUL DOSHIT
283
1
Pro-tip: it is excessively rare to find a valid use-case forInvoke-Expression. Avoid it whenever possible. What you want is the call operator (&)
– TheIncorrigible1
Mar 8 at 17:14
Using & sets the $? correctly, so I will know whether the command succeeded or failed. BUT, it won't set the $LASTEXITCODE to the command's return value.
– MRUDUL DOSHIT
Mar 9 at 3:34
add a comment |
I essentially require a functionality in Powershell that executes the given string (it can be a CMD/Powershell command, a perl/python/powershell with arguments or an exe with arguments, etc) captures its exit value.
In perl I would pass the string to 'system()' and use the '$CHILD_ERROR' perlval and shift it to access the exit code.
In powershell I am clueless.
I tried using Invoke-Expression, but even if the expression passed to Invoke-Expression fails, the Invoke-Expression call itself will have succeeded.
windows powershell perl exit exit-code
edited Mar 8 at 16:14
choroba
160k14142211
asked Mar 8 at 16:03
MRUDUL DOSHITMRUDUL DOSHIT
283
I essentially require a functionality in Powershell that executes the given string (it can be a CMD/Powershell command, a perl/python/powershell with arguments or an exe with arguments, etc) captures its exit value.
In perl I would pass the string to 'system()' and use the '$CHILD_ERROR' perlval and shift it to access the exit code.
In powershell I am clueless.
I tried using Invoke-Expression, but even if the expression passed to Invoke-Expression fails, the Invoke-Expression call itself will have succeeded.
windows powershell perl exit exit-code
windows powershell perl exit exit-code
edited Mar 8 at 16:14
choroba
160k14142211
asked Mar 8 at 16:03
MRUDUL DOSHITMRUDUL DOSHIT
283
edited Mar 8 at 16:14
choroba
160k14142211
asked Mar 8 at 16:03
MRUDUL DOSHITMRUDUL DOSHIT
283
edited Mar 8 at 16:14
choroba
160k14142211
edited Mar 8 at 16:14
choroba
160k14142211
edited Mar 8 at 16:14
choroba
160k14142211
160k14142211
asked Mar 8 at 16:03
MRUDUL DOSHITMRUDUL DOSHIT
283
asked Mar 8 at 16:03
MRUDUL DOSHITMRUDUL DOSHIT
283
asked Mar 8 at 16:03
MRUDUL DOSHITMRUDUL DOSHIT
283
283
1
Pro-tip: it is excessively rare to find a valid use-case forInvoke-Expression. Avoid it whenever possible. What you want is the call operator (&)
– TheIncorrigible1
Mar 8 at 17:14
Using & sets the $? correctly, so I will know whether the command succeeded or failed. BUT, it won't set the $LASTEXITCODE to the command's return value.
– MRUDUL DOSHIT
Mar 9 at 3:34
add a comment |
1
Pro-tip: it is excessively rare to find a valid use-case forInvoke-Expression. Avoid it whenever possible. What you want is the call operator (&)
– TheIncorrigible1
Mar 8 at 17:14
Using & sets the $? correctly, so I will know whether the command succeeded or failed. BUT, it won't set the $LASTEXITCODE to the command's return value.
– MRUDUL DOSHIT
Mar 9 at 3:34
1
1
Pro-tip: it is excessively rare to find a valid use-case for
Invoke-Expression. Avoid it whenever possible. What you want is the call operator (&)– TheIncorrigible1
Mar 8 at 17:14
Pro-tip: it is excessively rare to find a valid use-case for
Invoke-Expression. Avoid it whenever possible. What you want is the call operator (&)– TheIncorrigible1
Mar 8 at 17:14
Using & sets the $? correctly, so I will know whether the command succeeded or failed. BUT, it won't set the $LASTEXITCODE to the command's return value.
– MRUDUL DOSHIT
Mar 9 at 3:34
Using & sets the $? correctly, so I will know whether the command succeeded or failed. BUT, it won't set the $LASTEXITCODE to the command's return value.
– MRUDUL DOSHIT
Mar 9 at 3:34
add a comment |
1 Answer
1
active
oldest
votes
You can use $LASTEXITCODE to get the exit code from an external program or the Boolean $? to check if the last operation succeeded or failed. Run Get-Help about_Automatic_Variables -ShowWindow from a PowerShell console to see more details.
You may want to check out the & (call) command as an alternative to Invoke-Expression when running external programs. Run Get-Help about_Automatic_Variables -ShowWindow from a PowerShell console for details.
Also remember you may be able to just call the external program without using one of the commands above. See the example below:
param($Hostname="127.0.0.1", $Tries=1, $Wait=1000)
$output = ping.exe $Hostname -n $Tries -w $Wait # captures anything written to stdout
$output|? $_ -match 'Request timed out'|Write-Warning
$LASTEXITCODE # returns the exit code from ping.exe
You can copy it to a test.ps1 file and run it from a PowerShell console window (.test.ps1 8.8.8.8 for instance) to see how it works.
answered Mar 8 at 16:35
camilohecamilohe
441512
In my scenario I will always get the command as a parameter string, so I will need someone to execute it. Lets say the command is: $command = "mkdir aaa:bbbccc", which is sent as a script parameter. This command will obviously fail! But, after the statement: $output = Invoke-Expression $command, the $LASTEXITCODE is 0 (probably because the invoke-expression successfully fired mkdir, even though mkdir failed) and $? is also $True.
– MRUDUL DOSHIT
Mar 9 at 3:37
In this scenario you are running PowerShell's built-in mkdir command so $LASTEXITCODE is not set but you could use the call (&) command and trap the exception to handle the error. On the other hand, if you need to run the mkdir command from cmd.exe you'll need code like this:$cmd="cmd.exe"; $params="/c mkdir dir1dir2"; &$cmd $params; $LASTEXITCODE. Run it twice, it should succeed (and print 0) the first time and fail (and print 1) the second one as the folder will already exist.This way $LASTEXITCODE is populated as we are running an external program.
– camilohe
Mar 21 at 18:51
add a comment |
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You can use $LASTEXITCODE to get the exit code from an external program or the Boolean $? to check if the last operation succeeded or failed. Run Get-Help about_Automatic_Variables -ShowWindow from a PowerShell console to see more details.
You may want to check out the & (call) command as an alternative to Invoke-Expression when running external programs. Run Get-Help about_Automatic_Variables -ShowWindow from a PowerShell console for details.
Also remember you may be able to just call the external program without using one of the commands above. See the example below:
param($Hostname="127.0.0.1", $Tries=1, $Wait=1000)
$output = ping.exe $Hostname -n $Tries -w $Wait # captures anything written to stdout
$output|? $_ -match 'Request timed out'|Write-Warning
$LASTEXITCODE # returns the exit code from ping.exe
You can copy it to a test.ps1 file and run it from a PowerShell console window (.test.ps1 8.8.8.8 for instance) to see how it works.
answered Mar 8 at 16:35
camilohecamilohe
441512
In my scenario I will always get the command as a parameter string, so I will need someone to execute it. Lets say the command is: $command = "mkdir aaa:bbbccc", which is sent as a script parameter. This command will obviously fail! But, after the statement: $output = Invoke-Expression $command, the $LASTEXITCODE is 0 (probably because the invoke-expression successfully fired mkdir, even though mkdir failed) and $? is also $True.
– MRUDUL DOSHIT
Mar 9 at 3:37
In this scenario you are running PowerShell's built-in mkdir command so $LASTEXITCODE is not set but you could use the call (&) command and trap the exception to handle the error. On the other hand, if you need to run the mkdir command from cmd.exe you'll need code like this:$cmd="cmd.exe"; $params="/c mkdir dir1dir2"; &$cmd $params; $LASTEXITCODE. Run it twice, it should succeed (and print 0) the first time and fail (and print 1) the second one as the folder will already exist.This way $LASTEXITCODE is populated as we are running an external program.
– camilohe
Mar 21 at 18:51
add a comment |
You can use $LASTEXITCODE to get the exit code from an external program or the Boolean $? to check if the last operation succeeded or failed. Run Get-Help about_Automatic_Variables -ShowWindow from a PowerShell console to see more details.
You may want to check out the & (call) command as an alternative to Invoke-Expression when running external programs. Run Get-Help about_Automatic_Variables -ShowWindow from a PowerShell console for details.
Also remember you may be able to just call the external program without using one of the commands above. See the example below:
param($Hostname="127.0.0.1", $Tries=1, $Wait=1000)
$output = ping.exe $Hostname -n $Tries -w $Wait # captures anything written to stdout
$output|? $_ -match 'Request timed out'|Write-Warning
$LASTEXITCODE # returns the exit code from ping.exe
You can copy it to a test.ps1 file and run it from a PowerShell console window (.test.ps1 8.8.8.8 for instance) to see how it works.
answered Mar 8 at 16:35
camilohecamilohe
441512
In my scenario I will always get the command as a parameter string, so I will need someone to execute it. Lets say the command is: $command = "mkdir aaa:bbbccc", which is sent as a script parameter. This command will obviously fail! But, after the statement: $output = Invoke-Expression $command, the $LASTEXITCODE is 0 (probably because the invoke-expression successfully fired mkdir, even though mkdir failed) and $? is also $True.
– MRUDUL DOSHIT
Mar 9 at 3:37
In this scenario you are running PowerShell's built-in mkdir command so $LASTEXITCODE is not set but you could use the call (&) command and trap the exception to handle the error. On the other hand, if you need to run the mkdir command from cmd.exe you'll need code like this:$cmd="cmd.exe"; $params="/c mkdir dir1dir2"; &$cmd $params; $LASTEXITCODE. Run it twice, it should succeed (and print 0) the first time and fail (and print 1) the second one as the folder will already exist.This way $LASTEXITCODE is populated as we are running an external program.
– camilohe
Mar 21 at 18:51
add a comment |
You can use $LASTEXITCODE to get the exit code from an external program or the Boolean $? to check if the last operation succeeded or failed. Run Get-Help about_Automatic_Variables -ShowWindow from a PowerShell console to see more details.
You may want to check out the & (call) command as an alternative to Invoke-Expression when running external programs. Run Get-Help about_Automatic_Variables -ShowWindow from a PowerShell console for details.
Also remember you may be able to just call the external program without using one of the commands above. See the example below:
param($Hostname="127.0.0.1", $Tries=1, $Wait=1000)
$output = ping.exe $Hostname -n $Tries -w $Wait # captures anything written to stdout
$output|? $_ -match 'Request timed out'|Write-Warning
$LASTEXITCODE # returns the exit code from ping.exe
You can copy it to a test.ps1 file and run it from a PowerShell console window (.test.ps1 8.8.8.8 for instance) to see how it works.
answered Mar 8 at 16:35
camilohecamilohe
441512
You can use $LASTEXITCODE to get the exit code from an external program or the Boolean $? to check if the last operation succeeded or failed. Run Get-Help about_Automatic_Variables -ShowWindow from a PowerShell console to see more details.
You may want to check out the & (call) command as an alternative to Invoke-Expression when running external programs. Run Get-Help about_Automatic_Variables -ShowWindow from a PowerShell console for details.
Also remember you may be able to just call the external program without using one of the commands above. See the example below:
param($Hostname="127.0.0.1", $Tries=1, $Wait=1000)
$output = ping.exe $Hostname -n $Tries -w $Wait # captures anything written to stdout
$output|? $_ -match 'Request timed out'|Write-Warning
$LASTEXITCODE # returns the exit code from ping.exe
You can copy it to a test.ps1 file and run it from a PowerShell console window (.test.ps1 8.8.8.8 for instance) to see how it works.
answered Mar 8 at 16:35
camilohecamilohe
441512
edited Mar 8 at 17:08
answered Mar 8 at 16:35
camilohecamilohe
441512
answered Mar 8 at 16:35
camilohecamilohe
441512
answered Mar 8 at 16:35
camilohecamilohe
441512
441512
In my scenario I will always get the command as a parameter string, so I will need someone to execute it. Lets say the command is: $command = "mkdir aaa:bbbccc", which is sent as a script parameter. This command will obviously fail! But, after the statement: $output = Invoke-Expression $command, the $LASTEXITCODE is 0 (probably because the invoke-expression successfully fired mkdir, even though mkdir failed) and $? is also $True.
– MRUDUL DOSHIT
Mar 9 at 3:37
In this scenario you are running PowerShell's built-in mkdir command so $LASTEXITCODE is not set but you could use the call (&) command and trap the exception to handle the error. On the other hand, if you need to run the mkdir command from cmd.exe you'll need code like this:$cmd="cmd.exe"; $params="/c mkdir dir1dir2"; &$cmd $params; $LASTEXITCODE. Run it twice, it should succeed (and print 0) the first time and fail (and print 1) the second one as the folder will already exist.This way $LASTEXITCODE is populated as we are running an external program.
– camilohe
Mar 21 at 18:51
add a comment |
In my scenario I will always get the command as a parameter string, so I will need someone to execute it. Lets say the command is: $command = "mkdir aaa:bbbccc", which is sent as a script parameter. This command will obviously fail! But, after the statement: $output = Invoke-Expression $command, the $LASTEXITCODE is 0 (probably because the invoke-expression successfully fired mkdir, even though mkdir failed) and $? is also $True.
– MRUDUL DOSHIT
Mar 9 at 3:37
In this scenario you are running PowerShell's built-in mkdir command so $LASTEXITCODE is not set but you could use the call (&) command and trap the exception to handle the error. On the other hand, if you need to run the mkdir command from cmd.exe you'll need code like this:$cmd="cmd.exe"; $params="/c mkdir dir1dir2"; &$cmd $params; $LASTEXITCODE. Run it twice, it should succeed (and print 0) the first time and fail (and print 1) the second one as the folder will already exist.This way $LASTEXITCODE is populated as we are running an external program.
– camilohe
Mar 21 at 18:51
In my scenario I will always get the command as a parameter string, so I will need someone to execute it. Lets say the command is: $command = "mkdir aaa:bbbccc", which is sent as a script parameter. This command will obviously fail! But, after the statement: $output = Invoke-Expression $command, the $LASTEXITCODE is 0 (probably because the invoke-expression successfully fired mkdir, even though mkdir failed) and $? is also $True.
– MRUDUL DOSHIT
Mar 9 at 3:37
In my scenario I will always get the command as a parameter string, so I will need someone to execute it. Lets say the command is: $command = "mkdir aaa:bbbccc", which is sent as a script parameter. This command will obviously fail! But, after the statement: $output = Invoke-Expression $command, the $LASTEXITCODE is 0 (probably because the invoke-expression successfully fired mkdir, even though mkdir failed) and $? is also $True.
– MRUDUL DOSHIT
Mar 9 at 3:37
In this scenario you are running PowerShell's built-in mkdir command so $LASTEXITCODE is not set but you could use the call (&) command and trap the exception to handle the error. On the other hand, if you need to run the mkdir command from cmd.exe you'll need code like this:
$cmd="cmd.exe"; $params="/c mkdir dir1dir2"; &$cmd $params; $LASTEXITCODE. Run it twice, it should succeed (and print 0) the first time and fail (and print 1) the second one as the folder will already exist.This way $LASTEXITCODE is populated as we are running an external program.– camilohe
Mar 21 at 18:51
In this scenario you are running PowerShell's built-in mkdir command so $LASTEXITCODE is not set but you could use the call (&) command and trap the exception to handle the error. On the other hand, if you need to run the mkdir command from cmd.exe you'll need code like this:
$cmd="cmd.exe"; $params="/c mkdir dir1dir2"; &$cmd $params; $LASTEXITCODE. Run it twice, it should succeed (and print 0) the first time and fail (and print 1) the second one as the folder will already exist.This way $LASTEXITCODE is populated as we are running an external program.– camilohe
Mar 21 at 18:51
add a comment |
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1
Pro-tip: it is excessively rare to find a valid use-case for
Invoke-Expression. Avoid it whenever possible. What you want is the call operator (&)– TheIncorrigible1
Mar 8 at 17:14
Using & sets the $? correctly, so I will know whether the command succeeded or failed. BUT, it won't set the $LASTEXITCODE to the command's return value.
– MRUDUL DOSHIT
Mar 9 at 3:34