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Operating Systems Linux Ubuntu Bash to Ash, errors and adjustments Post 302907241 by Corona688 on Thursday 26th of June 2014 06:39:12 PM
Old 06-26-2014
The version of ash I have appears to support -n:

Code:
$ busybox ash
# IFS="" read -r -n 1 REPLY
q
# echo $REPLY
q
#

It returns immediately after 1 byte is read.

You could also do lots of tricky things with dd and stty, which might work more reliably. From this thread:

Code:
inkey() { char="" ; stty -icanon min 0 time 1 ; char=`dd count=1 if=/dev/tty 2>/dev/null` ; }

The reason this is more reliable is, if someone hits F1 and dumps \x1b[11~ into your terminal, that'd be one keystroke with inkey() and five keystrokes with read -n.

Also, inkey times out eventually, leaving "char" blank if nothing was typed. The timeout is in tenths of a second, for 1 second it'd be "time 10" for example.

If you gave it an infinite timeout, it might start waiting for entire lines again, terminals are tricky like that.

It works in ash for me, though it mostly depends on whether whatever embedded thing you're using has stty.

Last edited by Corona688; 06-26-2014 at 11:53 PM..
 

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SURFRAW-UPDATE-PATH(1)					User Contributed Perl Documentation				    SURFRAW-UPDATE-PATH(1)

NAME
surfraw-update-path - updates PATH in shell config files SYNOPSIS
surfraw-update-path [-add] [-remove] [-check] [-sys] [-all] [-help] [-shell=SHELL] DESCRIPTION
surfraw-update-path adds the surfraw elvi directory (/usr/lib/surfraw) to your PATH in your shell's config file. Currently it supports bash, sh, csh, tcsh, ash, dash, ksh, pdksh, zsh, rc, and es Don't forget to login again or source your login files for it to take effect. OPTIONS
-check Checks to see if the surfraw config code is present. This is the default. -add Adds the surfraw config code. -remove Removes the surfraw config code -sys Updates the system-wide shell config instead of the user. Must be done as root. -shell=SHELL Selects the shell to configure. Defaults to the value of the $SHELL environment variable. Currently supported shells are: sh, ash, bash, dash, csh, tcsh, ksh, pdksh, zsh, rc, and es. -all Attempts to configure the startup files for all known shells -help Gives a usage message RETURN VALUE
-check returns 0 if the surfraw code is present in the file, 1 if it is not found, or 2 on error. All other options return 0 on success, or 2 on error. ENVIRONMENT
SHELL Used to determine which shell to configure, if -shell is not given. HOME Used to find users config files. ENV Used by posix-compliant shells to specify a startup rc file. ZDOTDIR Used to find user config files for zsh. If not set, defaults to HOME. SEE ALSO
surfraw(1), sh(1), ash(1), bash(1), dash(1), csh(1), tcsh(1), ksh(1), pdksh(1), zsh(1), rc(1), es(1) AUTHOR
Ian Beckwith <ianb@erislabs.net> perl v5.12.4 2011-07-12 SURFRAW-UPDATE-PATH(1)
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