Re: [netrexx-pipelines] Strangeness when filtering linux stty output

[Marc R. <re...@gm...>]

On 7/31/23 13:03, Rony G. Flatscher wrote:
> According to "https://linux.die.net/man/1/stty" "stty --all" would print all settings (to stdout I assume).

True :

$ stty --all
speed 38400 baud; rows 30; columns 99; line = 0;
intr = ^C; quit = ^\; erase = ^?; kill = ^U; eof = ^D; eol = <undef>; eol2 = <undef>;
swtch = <undef>; start = ^Q; stop = ^S; susp = ^Z; rprnt = ^R; werase = ^W; lnext = ^V;
discard = ^O; min = 1; time = 0;
-parenb -parodd -cmspar cs8 -hupcl -cstopb cread -clocal -crtscts
-ignbrk -brkint -ignpar -parmrk -inpck -istrip -inlcr -igncr icrnl ixon -ixoff -iuclc -ixany
-imaxbel iutf8
opost -olcuc -ocrnl onlcr -onocr -onlret -ofill -ofdel nl0 cr0 tab0 bs0 vt0 ff0
isig icanon iexten echo echoe echok -echonl -noflsh -xcase -tostop -echoprt echoctl echoke -flusho
-extproc
$ echo dog | stty
stty: 'standard input': Inappropriate ioctl for device

The first command is attached to a terminal (either a 'real' terminal, but more likely a pseudo-terminal), and shows its settings.
The second command's stdin is the stdout of the echo command, and says so..

Also check the tty command:
$ tty
/dev/pts/6
$ echo dog | tty
not a tty

Marc