High Quality Content by WIKIPEDIA articles! Sqsh (pronounced skwish), short for SQSHell (pronounced s-q-shell), is an open source substitute for isql, the interactive SQL client supplied with Sybase`s Adaptive Server Enterprise (ASE) relational database management system. Besides supporting or emulating most of the features that isql provides, sqsh provides a reasonably rich set of features that users have been asking of isql for the last couple of years.