TCL-Expect scripts are an amazingly easy way to script out laborious tasks in the shell when you need to be interactive with the console. Think of them as a "macro" or way to programmaticly step through a process you would run by hand. They are similar to shell scripts but utilize the .tcl extension and a different #! call.
The first step, similar to writing a bash script, is to tell the script what it's executing under. For expect we use the following:
#!/usr/bin/expect
| /* Read kernel IPv4 routes from main routing table | |
| * | |
| * Copyright (c) 2021 Joachim Wiberg <troglobit@gmail.com> | |
| * | |
| * Permission to use, copy, modify, and/or distribute this software for any | |
| * purpose with or without fee is hereby granted, provided that the above | |
| * copyright notice and this permission notice appear in all copies. | |
| * | |
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
| # ~/.config/gtk-3.0/settings.ini | |
| [Settings] | |
| gtk-icon-theme-name = Adwaita-dark | |
| gtk-theme-name = Adwaita-dark | |
| gtk-font-name = DejaVu Sans 11 |
| -- Copy from /etc/xdg/awesome/rc.lua to .config/awesome/rc.lua | |
| -- | |
| -- My additions | |
| local r = require("runonce") | |
| ... | |
| -beautiful.init(gears.filesystem.get_themes_dir() .. "default/theme.lua") | |
| +beautiful.init(gears.filesystem.get_themes_dir() .. "zenburn/theme.lua") | |
| ... | |
| - }, properties = { titlebars_enabled = true } |
| -- @author Peter J. Kranz (Absurd-Mind, peter@myref.net) | |
| -- Any questions, criticism or praise just drop me an email | |
| local awful = require("awful") | |
| local M = {} | |
| -- get the current Pid of awesome | |
| local function getCurrentPid() | |
| -- get awesome pid from pgrep |
| Xft.antialias: true | |
| !xterm.termName: xterm-256color | |
| xterm*metaSendsEscape: true | |
| xterm*scrollBar: false | |
| xterm*scrollbar.width: 8 | |
| xterm*reverseVideo: on | |
| xterm*renderFont: default |
| [ 0.243765] PM: Magic number: 13:418:885 | |
| [ 0.243832] block2mtd: Using custom MTD label 'Config' for dev /dev/sda | |
| [ 0.867417] input: ImExPS/2 Generic Explorer Mouse as /devices/platform/i8042/serio1/input/input3 | |
| [ 0.868154] block2mtd: mtd0: [0] erase_size = 4KiB [4096] | |
| [ 0.868224] printk: console [netcon0] enabled |
Marvell>> printenv
baudrate=115200
bootargs=console=ttyMV0,115200 earlycon=ar3700_uart,0xd0012000 root=/dev/mmcblk0p1 rw rootwait net.ifnames=0 biosdevname=0
bootcmd=mmc dev 0; ext4load mmc 0:1 $kernel_addr $image_name;ext4load mmc 0:1 $fdt_addr $fdt_name;setenv bootargs $console root=/dev/mmcblk0p1 rw rootwait net.ifnames=0 biosdevname=0; booti $kernel_addr - $fdt_addr
bootdelay=2
console=console=ttyMV0,115200 earlycon=ar3700_uart,0xd0012000
eth1addr=00:51:82:11:22:01
| C-x C-f /sshx:amazon: |
The UNIX utility dd is actually inherited from VMS, hence the opt=arg instead of --opt=arg syntax.
Here we write the input file (if) to the output file (of), using a larger block size (bs) than default (512 bytes). We'd like to see the progress of the write, this is not the default, and we want to avoid caching in the Linux VFS, so we set output flag (oflag) to direct, i.e. write-through.
sudo dd if=linuxmint-20-cinnamon-64bit.iso of=/dev/sdb bs=1M status=progress oflag=direct
Watch out, check the output file (/dev/sdb) matches your USB stick, otherwise you'll kill all the kittens!