Sqlplus Error 57 Initializing Sql-plus Error Loading Message Shared Library -

This is a classic on Unix/Linux. Error 57 usually points to a missing or incompatible system library or incorrect environment variables .

: Many solutions online focus on library paths, but the actual root cause is often NLS (National Language Support) - SQL*Plus can't find its language-specific message file, usually sp1<lang>.msb in $ORACLE_HOME/sqlplus/mesg/ . This is a classic on Unix/Linux

What OS and Oracle version are you running? That would help narrow down the exact fix. This is a classic on Unix/Linux