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I am trying to perform this: i have a test file which md5sum of files located on sftp. variables should contain an md5sum (string), if the variable is empty it means there is no file on the sftp server. i am trying this code but it does not work..
if [ -z $I_IDOCMD5 ] || [ -z $I_LEGALMD5 ] || [ -z $I_ZIPMD5 ] then echo "ERROR: At least one file not present of checksum missing no files will be deleted" >>$IN_LOG ERRORS=$ERRORS+2 else if [[ $I_IDOCMD5 == $($DIGEST -a md5 $SAPFOLDER/inward/idoc/$I_IDOC) ]] then echo "rm IDOC/$I_IDOC" >/SAP/commands_sftp.in else echo "problem with checksum" ERRORS=$ERRORS+2 fi if [[ $I_LEGALMD5 == $($DIGEST -a md5 $SAPFOLDER/inward/legal/$I_LEGAL) ]] then echo "rm LEGAL/$I_LEGAL" >>/SAP/commands_sftp.in else echo "problem with checksum" ERRORS=$ERRORS+2 fi if [[ $I_ZIPMD5 == $($DIGEST -a md5 $SAPFOLDER/inward/zip/$I_ZIP) ]] then echo "rm ZIP/$I_ZIP" >>/SAP/commands_sftp.in else echo "problem with checksum" ERRORS=$ERRORS+2 fi 
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Use the -z Flag in Bash The -z flag is a parameter that checks if the length of a variable is zero and returns true if it is zero. In the example below, the -z flag is used with the test command, and it is tested whether the given string is empty. Bash.
PHP empty() Function The empty() function checks whether a variable is empty or not. This function returns false if the variable exists and is not empty, otherwise it returns true. The following values evaluates to empty: 0.
The answer I prefer is following
[[ -z "$1" ]] && { echo "Parameter 1 is empty" ; exit 1; } Note, don't forget the ; into the {} after each instruction
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