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Diffstat (limited to 'Doc/help/ttyctl')
| -rw-r--r-- | Doc/help/ttyctl | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Doc/help/ttyctl b/Doc/help/ttyctl new file mode 100644 index 000000000..bcccb3453 --- /dev/null +++ b/Doc/help/ttyctl @@ -0,0 +1,22 @@ +ttyctl [ -fu ] + The -f option freezes the tty (i.e. terminal or terminal emula- + tor), and -u unfreezes it. When the tty is frozen, no changes + made to the tty settings by external programs will be honored by + the shell, except for changes in the size of the screen; the + shell will simply reset the settings to their previous values as + soon as each command exits or is suspended. Thus, stty and sim- + ilar programs have no effect when the tty is frozen. Freezing + the tty does not cause the current state to be remembered: in- + stead, it causes future changes to the state to be blocked. + + Without options it reports whether the terminal is frozen or + not. + + Note that, regardless of whether the tty is frozen or not, the + shell needs to change the settings when the line editor starts, + so unfreezing the tty does not guarantee settings made on the + command line are preserved. Strings of commands run between + editing the command line will see a consistent tty state. See + also the shell variable STTY for a means of initialising the tty + before running external commands and/or freezing the tty around + a single command. |