Tiny Core Linux
Tiny Core Base => TCB Talk => Topic started by: ost on September 28, 2011, 04:25:08 AM
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The shell command "read" does not have a --help or -h option to explain its supported options.
Can anyone point me to a doc?
(I use microcore_4.0)
Im trying to do "read line1 line2", and need a flag to tell it to grab full lines.
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Im going to reply myself here..
It looks like read does a line grab and shares it on the list of arguments based on some separators (space is one of them)
To pipe two lines to two variables I have to do ..|(read line1;read line2)
But a complete doc would still be nice.
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You don't find documentation of "read", because it's a shell builtin. Try
type read
A possible option for a start is the bash manual. The ash used features a large subset of bash. So not everything you'll find there will fit (mostly not all options are implemented), but it's a fair start for understanding the builtin shell commands.
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Hi ost
Here's a pretty good link on bash commands
http://ss64.com/bash/ (http://ss64.com/bash/)
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In general I tend to use this page (http://linux.die.net/man/1/ash) to as a man-page for 'ash'. But if it comes to some finer details like what options are supported by a particular builtin function of a BusyBox applet I found reading the source code to be the best approach. Of course I would then have to validate any "findings" trough some testing.
My hunch is that the 'readcmd()' function of the 'shell/ash.c' file is responsible for parsing of the 'read' options. Therefore I'd assume that the '-n nchars', '-p prompt', '-t timeout', '-u fd', '-r', and '-s' are supported.
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Thanks to all of you. I learnt something from this :)