linux - Redirect stdout to stderr in shell -

-

i unable shell command output ran on ssh.

for example

output=$(utility_function ssh $host "pwd 2>&1" 2>&1)

the problem run ssh command, utility_function , utility_function returns "exit code" in stdout. so, because stdout being, used function exit code that's why can't able command output. trying redirect stdout stderr command i'm not capturing output.

output=$(utility_function ssh $host "pwd 2>&1" 2>&1)

the problem in functions, , without more info can't there. if know how, can clone stdout file descriptor 3, , have functions use it, instead of &1 write exit code. also, if function isn't written right, redirect being ignored-- no way know info.

assuming don't, need not redirect pwd command, , instead filter out return code-- if this, lose echo'd return codes function.

this work no matter how function written-- though guessing @ number on tail, b/c don't know how output being spit out disconnect. it's hard troubleshoot blind function , how works. read -r output < <(utility_function ssh $host "pwd" |tail -2|head -1)

you can juggle file descriptors this, , if function uses redirect in string send, should work.

output=$(exec 3>&2; utility_function ssh $host 'pwd >&2' 2>&1 1>&3)

if neither of work, output of what's going on , more data required.


Comments

Post a Comment

Popular posts from this blog

magento2 - Magento 2 admin grid add filter to collection -

-
i created grid in admin xml ui components. need filter collection via url parameter , dont know how achieve that. tried inject requestinterface collection, filter didnt work. di.xml <virtualtype name="slidelistingdataprovider" type="magento\framework\view\element\uicomponent\dataprovider\dataprovider"> <arguments> <argument name="collection" xsi:type="object" shared="false">xxx\xxx\model\resourcemodel\grid\slide\collection</argument> <argument name="filterpool" xsi:type="object" shared="false">slidelistingfilterpool</argument> <!-- define new object filters --> </arguments> </virtualtype> <virtualtype name="slidelistingfilterpool" type="magento\framework\view\element\uicomponent\dataprovider\filterpool"> <arguments> <argument name="applier...
Read more

Android volley - avoid multiple requests of the same kind to the server? -

-
i using volley upload list of images server. happens within service. once image uploaded remove list. problem arises when internet connection breaks. when internet connection breaks , comes again thinking of adding images yet uploaded request queue. this can result in more 1 copy of same image saved on server request same image might have gone through before getting rseponse. how can address scenario? i'm not quite sure why you're using service schedule requests volley automatically runs it's request in seperate thread. nevertheless can listen both request results, successful , unsuccessful adding listeners. you can remove image list schedule request using volley. if succeeds can carry on desired, if fails can add again list. public static request getimageuploadrequest(final string image) { response.listener<t> responselistener = new response.listener<t>() { @override public void onresponse(t response...
Read more

Combining PHP Registration and Login into one class with multiple functions in one PHP file -

-
i'm trying combine registration, activation , login scripts php website backend script front end developer can pass variables different forms to. my question whether appropriate approach this. don't want have lot of php files different pieces of application developing. far have written following 2 functions login, register , activate user front end developer can call: <?php /** * created phpstorm. * user: karl * date: 26/07/2016 * time: 02:25 */ class users { function register_user($email, $password, $user_name) { $server_name = "localhost"; $u_name = "root"; $db_password = "root"; $db_name = "betamath_graspe"; //email notification variable $from_address="info@slack.com"; //registration form $msg_reg_user='username taken. please choose different username'; $msg_reg_email='email registered'; $msg_reg_active=...
Read more