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As it says on the tin. You create a command name which is egrep '2019-05-11|Total' and then try to call it. This is not a egrep followed by a parameter but a complete command name. What you want is more likely:

totalSize=$(echo $s3ls| egrep "$currentDate|Total" | awk -F 'Total Size:' '{print $2}'|sed '/^$/d')

If necessary you can use a variable to hold the parameter:

egrepParm="$currentDate|Total" 
totalSize=$(echo $s3ls| egrep "$egrepParm" | awk -F 'Total Size:' '{print $2}'|sed '/^$/d')

Some will say that in a script it is best to use grep -E instead of egrep

As it says on the tin. You create a command name which is egrep '2019-05-11|Total' and then try to call it. This is not a egrep followed by a parameter but a complete command name. What you want is more likely:

totalSize=$(echo $s3ls| egrep "$currentDate|Total" | awk -F 'Total Size:' '{print $2}'|sed '/^$/d')

If necessary you can use a variable to hold the parameter:

egrepParm="$currentDate|Total" 
totalSize=$(echo $s3ls| egrep "$egrepParm" | awk -F 'Total Size:' '{print $2}'|sed '/^$/d')

Some will say that in a script it is best to use grep -E instead of egrep

PS: An aliased command will work in the command prompt/terminal but not in a script, so trying the command in the terminal isn't proof that it will work in a script. In bash, use type {commandname} to check if the name is a real command or an alias. egrep can be implemented as an alias in some Unix versions, in my Ubuntu it is a plain command.

As it says on the tin. You create a command name which is egrep '2019-05-11|Total' and then try to call it. This is not a egrep followed by a parameter but a complete command name. What you want is more likely:

totalSize=$(echo $s3ls| egrep "$currentDate|Total" | awk -F 'Total Size:' '{print $2}'|sed '/^$/d')

If necessary you can use a variable to hold the parameter:

egrepParm="$currentDate|Total" 
totalSize=$(echo $s3ls| egrep "$egrepParm" | awk -F 'Total Size:' '{print $2}'|sed '/^$/d')

As it says on the tin. You create a command name which is egrep '2019-05-11|Total' and then try to call it. This is not a egrep followed by a parameter but a complete command name. What you want is more likely:

totalSize=$(echo $s3ls| egrep "$currentDate|Total" | awk -F 'Total Size:' '{print $2}'|sed '/^$/d')

If necessary you can use a variable to hold the parameter:

egrepParm="$currentDate|Total" 
totalSize=$(echo $s3ls| egrep "$egrepParm" | awk -F 'Total Size:' '{print $2}'|sed '/^$/d')

Some will say that in a script it is best to use grep -E instead of egrep

As it says on the tin. You create a command name which is egrep '2019-05-11|Total' and then try to call it. This is not a egrep followed by a parameter but a complete command name. What you want is more likely:

totalSize=$(echo $s3ls| grep -E "$currentDate|Total" | awk -F 'Total Size:' '{print $2}'|sed '/^$/d')

If necessary you can use a variable to hold the parameter:

egrepParm="$currentDate|Total" 
totalSize=$(echo $s3ls| grep -E "$egrepParm" | awk -F 'Total Size:' '{print $2}'|sed '/^$/d')

As it says on the tin. You create a command name which is egrep '2019-05-11|Total' and then try to call it. This is not a egrep followed by a parameter but a complete command name. What you want is more likely:

totalSize=$(echo $s3ls| egrep "$currentDate|Total" | awk -F 'Total Size:' '{print $2}'|sed '/^$/d')

If necessary you can use a variable to hold the parameter:

egrepParm="$currentDate|Total" 
totalSize=$(echo $s3ls| egrep "$egrepParm" | awk -F 'Total Size:' '{print $2}'|sed '/^$/d')