Question: how to convert xls file to csv in linux?
Answer: Installing SSConvert to convert xls file to csv file in Linux. For REDHAT ,CENTOS and FEDORA. yum install gnumeric. yum install gnumeric. For UBUNTU and DEBIAN. ... 
Installing unoconv program to convert xls file to csv file in Linux. For REDHAT ,CENTOS and FEDORA. yum install unoconv. yum install unoconv. For UBUNTU and DEBIAN.