python - roboframework script issue -

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in robotframework, trying execute command on server, taking output in variable , comparing output empty or not empty getting error.

robot script:

${redrelease}   execute command root , return result   ${server}   cat /etc/redhat-release | grep '6.7'  run keyword if  '${redrelease}'=='${empty}' should contain  xxx    yyyy

but getting error:

evaluating expression '' red hat enterprise linux server release 6.7 (santiago)'==''' failed: syntaxerror: no viable alternative @ character ''' (<string>, line 1)

how can compare output of grep command empty or non empty?

roboframework provides in-built library "sshlibrary" helps in dealing same.

for example : 

*** settings *** library           sshlibrary   *** variables *** ${host}           127.0.0.1 ${username}       labadmin ${password}       root123 ${command}        cat /etc/*release  *** test cases ***  login_to_server     open connection    ${host}     login    ${username}    ${password}     ${output}    execute command    ${command}     should contain    ${output}    "ubuntu"

modify above snippet according setup.


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