NOTES

ASCII tables

The control character names are mostly generics, but what’s included are the names used by Epson ESCPOS interpreter. Similar to what you get from man ascii.

ascii.pdf — full table
- ascii.jpg — in .jpg
- ascii.png — in .png
- ascii.webp — in .webp
ascii-hex.pdf — mini-table in hex
ascii-dec.pdf — mini-table in dec

Converting ASCII name/char and binary

printat.sh

Shell script to convert ASCII name to binary data, or binary data to ASCII name.

Usage

printat.sh asc... > bin
printat.sh < asc > bin
printat.sh -r < bin > asc
printat.sh -h

Description

printat.sh asc... > bin

If argument is ASCII name/char, then print the ASCII value.

If it’s decimal [0-9]+, hex [0-9a-fA-F]+h or 0x[0-9a-fA-F]+, then print the number in little-endian format. If the number is inside word(...), print only the last 2 bytes. If dword(...), print the last 4 bytes. If a number starts with ' (apostrophe), treat the number as string, like spreadsheet does.

Otherwise, it’s string, so print it verbatim.
```
printat.sh NUL ESC              # 0x00 0x1b
printat.sh 0 48 1bh 0x1b        # NUL 0 ESC ESC
printat.sh word(258)            # 0x02 0x01
printat.sh dword(0x04030201)    # 0x01 0x02 0x03 0x04
printat.sh abcd                 # abcd
```
printat.sh < asc > bin

Same, but read from file instead of command line. Contents will be broken up into whitespace separated words.
printat.sh -r < bin > asc

If -r is the only argument, then do the reverse. Convert binary to ASCII name/char. Similar to od -a but uppercase ASCII name/char, and no line breaks.
printat.sh -h

Print this.