3
votes
5answers
447 views

What are the special characters to print from a script to move the cursor?

I found that by printing \r from a script the cursor moves to the beginning of the line. What character will move the cursor up one line? Where is a list of these special characters? EDIT: Working ...
2
votes
1answer
489 views

Double line box_drawing characters in terminal

This piece of code in wikipedia: $ char=( 6a 6b 6c 6d 6e 71 74 75 76 77 78 ) $ for i in ${char[*]}; do printf "0x$i \x$i \e(0\x$i\e(B\n"; done includes one-line box-drawing characters. Are there ...
2
votes
2answers
1k views

What does the tilde (~) mean at the end of a filename? [duplicate]

What is the file with the ~ at the end of the filename for? $ ls # aliased to add flags -rwxrwxr-x 1 durrantm 2741 May 16 09:28 strip_out_rspec_prep_cmds.sh~* drwxrwxr-x 13 durrantm 4096 May 16 ...
49
votes
7answers
2k views

How safe is it to cat an arbitrary file?

Sometimes when I cat a binary file by mistake, my terminal gets garbled up. Nothing a quick reset can't fix, but couldn't an attacker theoretically create a file that, when displayed on a terminal, ...
0
votes
1answer
58 views

What characters in my printed boot scroll are artifacts?

I am a tech writer and I need to include a boot dump in a document. The dump the engineers gave me has some "bad characters" that I need to delete. What form does a "bad character" take? There are ...
3
votes
2answers
226 views

Hash symbol on a teletype

My issue is a bit unusual, so I want to provide a short background. I was looking at old winners of the International Obfucated C Code Contest, and came across an entry written for the PDP-11 (the ...
8
votes
2answers
409 views

Command line input while a running script displays strange symbols

If I use the bash shell cli and run some program which doesn't return immediately, then I input some letters (basically typing the next command before noticing the previous didn't finish) and the ...
2
votes
1answer
194 views

Control character STTY issue

I am changing control character (e.g- ^C) using stty intr ^_ under root privileges. It changes successfully. But when I am closing terminal and opening terminal again to check whether same ...
7
votes
2answers
273 views

Why doesn't `echo abc^H` just print `ab`?

As I recall, ^H means Backspace. I generated it by pressing CTRL+V, CTRL+H. So the ^H should remove the last character, as it is the same as Backspace and it should act just as if I pressed Backspace ...