How to generate letter sequence list in fish shell

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In bash you can generate letter sequence easily as "{a..z}", for example

$ echo {a..z}
a b c d e f g h i j k l m n o p q r s t u v w x y z

How to do that in the fish shell instead?

Fish doesn't support ranges in brace expansion, only comma-separated values: {a,b,c}.

Thus, we are forced to search for a command capable of generating such sequence. For example, you can use Perl:

for c in (perl -e '$,="\n"; print ("a" .. "z")')
  printf ">> %s\n" "$c"
end

where $, is the output field separator.

Output

>> a
>> b
...(skipped)
>> y
>> z

You may find this table useful.

Printing a Sequence of Letters or Numbers, Learn how to use seq or and Bash Braces Expansion to generate sequence of letters or numbers. All Shell Scripting Tips. 20 May 2015. Generating Sequences in Bash. A useful but underused feature of the Bash shell is called Brace Expansion. It takes a few different forms, but basically, anything within the { braces } is expanded, either as a list ({apples,oranges,bananas}), a numerical sequence ({1..10}), or characters ({a..z}). TL;DR.

One way is to use printf and seq.

echo -e (printf '\\\x%x\n' (seq 97 122))

This works by generating "\x61 \x62 \x63 ... \x7a" which is then interpreted by "echo -e" as hex character codes.

Commands, Abbreviations are user-defined character sequences or words that are replaced with longer phrases The following code runs the make command to build a program. Use bind --function-names for a complete list of these input functions. You don’t have to type a range of numbers by hands! BASH already has a built-in utility, named seq, for generating and printing a sequence of numbers. Generate a sequence of numbers Syntax: seq [OPTION]… FIRST Syntax: seq [OPTION]… FIRST LAST Print a sequence of numbers from 1 to 10: $ seq 1 5 1 […]

Linux has the seq command for this, and it works with fishshell:

$ for f in (seq 1 10)
    echo $f
end
1
2
3
4
5
6
7
8
9
10
$

Generate list of letters, BTW, in bash you have list=( $(echo {a..z} )) num2char() { # NUM # Returns a letter string: a-z # Or: Generate list of directories that a user has access to. In this post, we show how to generate a sequence of numbers in shell, and use for loop to print out the numbers. How to generate a range of number in Shell or Bash. The answer is using the seq command, here is the seq command syntax:

shell/bash generate random alphanumeric string · GitHub, bash generate random 32 character alphanumeric string (lowercase only). cat /​dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1. # Random numbers in a  Type 15@x and your macro will be replayed 15 times, so your screen will now show your list from 1 to 17. Then if you want more lines, you can just type, for instance, 500@x . If you have too many lines, type the letter k to move up in the file and j to go down.

Speaking UNIX: Go fish!, In the sequence above, the variable var is set to the two-letter string ls. runs as a shell command to produce the contents of the local directory. Generate list of letters Heyas I want to list passed arguments and make an incrementing 'marker'. That 'marker' should be a letter between a-z, in proper order.

Bash Range: How to iterate over sequences generated on the shell , You can iterate the sequence of numbers in bash by two ways. but if the sequence starts from integer then the list of decimal integers will print. The following command is used to generate the sequence of floating point number using “%f” . Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more How to iterate for loop with limiting sequence in fish shell

Comments
  • On OS X and BSD, the jot command is useful: jot -c - a z.
  • Thanks, end up with hard code a list variable like "set letters a b c d e f g h i j k l m n o p q r s t u v w x y z"
  • This answer is not quite correct. Fish does support integer ranges.
  • Downvoted because this doesn't answer the question in any way.