i was trying to search for the string "save text
image" in all man pages, so 
i did 
$ man -K "save text image"

and also

$ man -K "save\ text\ image"

in both cases, bash returned

"sh: unsafe: command not found."

which kept scrolling through the screen until i ended
it with ctrl-c.

however, "man -K" works nicely with single-word
arguments.

is this a bug or a feature?  :-)

how can i find the specified string in all man pages?

and will someone enlighten me about the function of
"chmod 1---  " ?

chmod 4--- sets the user id.

chmod 2--- sets the group id.

"man chmod" says "chmod 1---" sets "save text image".

what is "save text image" ? how does it work?

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