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Top Forums Shell Programming and Scripting Generate a string of alphanumeric characters Post 303032694 by nezabudka on Friday 22nd of March 2019 04:38:08 AM
Old 03-22-2019
Well, better let's look at the example.
First, let's make the sequence of 62 characters.
Code:
echo $'\n'{{0..9},{A..Z},{a..z}}

Now we have 62 characters per line (Excluding the first line with the character $'\n').
Let's see how many combinations of 2 characters are possible.
Code:
echo $'\n'{{0..9},{A..Z},{a..z}}{{0..9},{A..Z},{a..z}} | wc -l

Subtract 1 ($'\n') from the resulting value, and we get the number 3844 variants.
Add chili pepper to three and get...
Code:
time echo $'\n'{{0..9},{A..Z},{a..z}}{{0..9},{A..Z},{a..z}}{{0..9},{A..Z},{a..z}} | wc -l
> 238328

And the time spent by my laptop will be
Code:
real    0m0,983s

And the last option of the four elements. Prevent you from even running this command!
Code:
time echo $'\n'{{0..9},{A..Z},{a..z}}{{0..9},{A..Z},{a..z}}{{0..9},{A..Z},{a..z}}{{0..9},{A..Z},{a..z}} | wc -l
>14776336 #minus 1
real    2m49,353s

for the time being the command almost paralyzed my laptop.
And this is only a combination of 4 items from 62
Thanks for attention.

Last edited by nezabudka; 03-22-2019 at 06:28 AM..
 

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basename(1)						      General Commands Manual						       basename(1)

NAME
basename, dirname - extract portions of path names SYNOPSIS
string [suffix] [string] DESCRIPTION
deletes any prefix ending in and the suffix (if present in string) from string, and prints the result on the standard output. If string consists entirely of slash characters, string is set to a single slash character. If there are any trailing slash characters in string, they are removed. If the suffix operand is present but not identical to the characters remaining in string, but it is identical to a suf- fix of the characters remaining in string, the suffix is removed from string. is normally used inside command substitution marks within shell procedures. delivers all but the last level of the path name in string. If string does not contain a directory component, returns indicating the cur- rent working directory. EXTERNAL INFLUENCES
Environment Variables determines the interpretation of string and, in the case of basename, suffix as single and/or multi-byte characters. If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari- able. If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization variable contains an invalid setting, and behave as if all internationalization variables are set to "C". See environ(5). International Code Set Support Single- and multi-byte character code sets are supported. EXAMPLES
The following shell script, invoked with the argument compiles the named file and moves the output to a file named in the current direc- tory: The following example sets the shell variable to RETURN VALUE
and return one of the following values: Successful completion. Incorrect number of command-line arguments. SEE ALSO
expr(1), sh(1). STANDARDS CONFORMANCE
basename(1)
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