[man] Clarify that $SHELL is used to run commands (#2334)

SHELL is used for execute actions and the preview and default commands.
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@ -570,7 +570,8 @@ Note that most options have the opposite versions with \fB--no-\fR prefix.
.TP .TP
.B FZF_DEFAULT_COMMAND .B FZF_DEFAULT_COMMAND
Default command to use when input is tty. On *nix systems, fzf runs the command Default command to use when input is tty. On *nix systems, fzf runs the command
with \fBsh -c\fR, so make sure that it's POSIX-compliant. with \fB$SHELL -c\fR if \fBSHELL\fR is set, otherwise with \fBsh -c\fR, so in
this case make sure that the command is POSIX-compliant.
.TP .TP
.B FZF_DEFAULT_OPTS .B FZF_DEFAULT_OPTS
Default options. e.g. \fBexport FZF_DEFAULT_OPTS="--extended --cycle"\fR Default options. e.g. \fBexport FZF_DEFAULT_OPTS="--extended --cycle"\fR
@ -890,6 +891,10 @@ executes the command without the switching. Note that fzf will not be
responsive until the command is complete. For asynchronous execution, start responsive until the command is complete. For asynchronous execution, start
your command as a background process (i.e. appending \fB&\fR). your command as a background process (i.e. appending \fB&\fR).
On *nix systems, fzf runs the command with \fB$SHELL -c\fR if \fBSHELL\fR is
set, otherwise with \fBsh -c\fR, so in this case make sure that the command is
POSIX-compliant.
.SS RELOAD INPUT .SS RELOAD INPUT
\fBreload(...)\fR action is used to dynamically update the input list \fBreload(...)\fR action is used to dynamically update the input list

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