Bash commands not working after upgrade to Lion

After upgrade, many BASH commands not working. For example, such a fundamental thing as "ls". 
iMac20:bin a$ ls
Launch of "ls" failed: the PowerPC architecture is no longer supported.
What does it have to do with PowerPC? My computer is 2.66 GHz Inter Core Duo

Linc,
iMac20:~ a$ which ls
/sw/bin/ls
Also, I managed to look (using tcsh's ls-F command) into the contents of /usr/. Here's what I see there:
[iMac20:/bin] a% ls-F
[*          csh*        echo*       ksh*        mkdir*      rcp*        stty*       wait4path*
bash*       date*       ed*         launchctl*  mv*         rm*         sync*       zsh*
cat*        dd*         expr*       link*       pax*        rmdir*      tcsh*      
chmod*      df*         hostname*   ln*         ps*         sh*         test*      
cp*         domainname* kill*       ls*         pwd*        sleep*      unlink*    

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