On a Debian 12 machine with bash 5.2.15-2+b7, I had this alias in my .bashrc
alias w3m='/usr/bin/w3m -no-cookie -o auto-image=TRUE ' I understand that aliases are frowned on and should be written as functions, so I wrote [[ $(type -t w3m) == "w3m" ]] && unalias w3m w3m() { /usr/bin/w3m -no-cookie -o auto-image=TRUE $@ ; } and received the error message bash: .bashrc: line 86: syntax error near unexpected token `(' bash: .bashrc: line 86: `w3m() { /usr/bin/w3m -no-cookie -o auto-image=TRUE $@ ; }' To fix this, I remove the numeral 3 from w3m, write wm() ... and then the error disappears. But the bash man page says that numerals are allowed in names although it doesn´t say if a name can be a function name: name A word consisting only of alphanumeric characters and underscores, and beginning with an alphabetic character or an under‐score. The man page also says that a function name is an fname (not a name), and says "a function name can be any unquoted shell word that does not contain $". Nothing in the man page appears to reject w3m so I do not understand why my function name w3m is refused. Roger