Hot answers tagged ascii
6
For hysterical historical reasons, od prints two-byte words¹ by default.
The number 020061 (octal) corresponds to the two-byte sequence 1␣ (␣ is a space character). Why? It's clearer if you use hexadecimal: 0o20061 = 0x2031, and ␣ is 0x20 (32) in ASCII and 1 is 0x31 (49). Notice that the lower-order bits (0x31) correspond to the first character and the ...
4
grep is the standard tool for searching for a pattern inside of files. It has an option for searching recursively, which means if it finds a directory, it goes inside and searches in everything in there.
The command would simply be grep -r shirt /path/to/girl/
I also like to add two options that skip files that I know I'm not interested in: ...
3
This is the hexundump script from my personal collection:
#!/usr/bin/env perl
$^W = 1;
$c = undef;
while (<>) {
tr/0-9A-Fa-f//cd;
if (defined $c) { warn "Consuming $c"; $_ = $c . $_; $c = undef; }
if (length($_) & 1) { s/(.)$//; $c = $1; }
print pack "H*", $_;
}
if (!eof) { die "$!"; }
if (defined $c) { warn "Odd number of ...
3
You can't directly print the ascii codes by using the printf "%c" $i like in C language.
You have to first convert the decimal value of i into its octal value and then you have to print it using using printf and putting \ in front of their respective octal values.
Eg. To print A, you have to convert the decimal 65 into octal i.e 101 and then you have to ...
2
Beside OCR-Software, which was my first idea too, I think of libaa1 (ascii-art) and related programs. There is even a program to watch TV in ascii-art, ttv, so there will be an image transforming program, I'm pretty sure.
And I remember a program in the ImageMagick package, where you can take a photograph of a flipchart, and it performs ocr on it. ...
2
Interesting question. After browsing the man page, I found that -o prints octal output (od == octal dump), the c you appended only prints the associated characters as well. You get the same numbers with -o alone.
Looking at the output it appears that od is reading data two bytes at a time. Take the first two characters for instance:
CHAR - OCTAL - BINARY
1 ...
2
Try doing this in a shell :
To test on STDOUT :
column -t file.txt
To modify the file :
column -t file.txt > new_file.txt && mv new_file.txt file.txt
As you can see, that's all you need. It saves you a lot of time playing with complicated printf tricks.
2
You could use aha (also packaged in some Linux distributions), to convert the ANSI colouring sequences to HTML:
#! /bin/sh -
sendmail -t -oi << EOF
To: myaddy@domain.com
Subject: Weekly Disk Report
MIME-Version: 1.0
Content-Type: text/html; charset="us-ascii"
Content-Disposition: inline
$(discus | aha)
EOF
2
As stated by Shawn, using grep -r might be enough for your needs.
Otherwise a combination of find and grep can do the trick:
find . -exec grep -H text '{}' ';'
This allows to refine the search using specific find predicates.
(And -H option is there so that filenames are printed along with the matched content.)
1
GNU banner
figlet
toilet (tutorial)
As usual, you can read their man pages with the commands man banner, etc.
You might find these scripts useful: reverse the output horizontally, pad the output
1
xxd(1) can do this:
$ cat test.txt
Test.
$ xxd -b test.txt
0000000: 01010100 01100101 01110011 01110100 00101110 00001010 Test..
From this forum post.
1
Simulate a byte train:
echo 41 42 43 44 |
Change spaces into newlines so the while/read can easily parse them on by one
tr ' ' '\n' |
Parse byte by byte
while read hex; do
Convert hex to ascii:
printf \\x$hex
until end of input
done
If the files to parse are seriously big, you probably don't want to use bash because it is slow. PERL for ...
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