Maximum length of a string Post: 302963037

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Top Forums Shell Programming and Scripting Maximum length of a string Post 302963037 by durden_tyler on Tuesday 22nd of December 2015 03:14:02 PM

12-22-2015

Registered User

Do you want to find the length of each line in a file?
Here's a complete example with a few methods to find the length:

Code:

$ 
$ cat data.log
cadena1
cadenados
cadenatercera
cadenatercera
beer
$ 
$ cat line_length.sh
#!/bin/bash
FILE="data.log"
while read linea
do
    largo=$(echo $linea | awk '{print length($0)}')   # One way to find length
    len=${#linea}                                     # And another way to find length
    len1=$(awk -v L=$linea 'BEGIN{print length(L)}')  # And another way to find length
    len2=$(expr length $linea)                        # And another way to find length
    len3=$(echo -n $linea | wc -c)                    # And another way to find length
    echo $largo,$len,$len1,$len2,$len3
done < $FILE
$ 
$ . line_length.sh
7,7,7,7,7
9,9,9,9,9
13,13,13,13,13
13,13,13,13,13
4,4,4,4,4
$ 
$

The title of the post suggests that maybe you want to find the maximum length of a line in a file.
Do you want to find out the length of the longest line in your file?
In that case, a complete example is posted below:

Code:

$ 
$ cat data.log
cadena1
cadenados
cadenatercera
cadenatercera
beer
$ 
$ cat max_line_length.sh
#!/bin/bash
MAX=0
FILE="data.log"
while read linea
do
    len=${#linea}
    if [ $len -gt $MAX ]
    then
        MAX=$len
    fi
done < $FILE
echo "Max length is $MAX"
$ 
$ . max_line_length.sh
Max length is 13
$ 
$

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wc

WC(1)									FSF								     WC(1)

NAME

       wc - print the number of bytes, words, and lines in files

SYNOPSIS

       wc [OPTION]... [FILE]...

DESCRIPTION

       Print  byte, word, and newline counts for each FILE, and a total line if more than one FILE is specified.  With no FILE, or when FILE is -,
       read standard input.

       -c, --bytes
	      print the byte counts

       -m, --chars
	      print the character counts

       -l, --lines
	      print the newline counts

       -L, --max-line-length
	      print the length of the longest line

       -w, --words
	      print the word counts

       --help display this help and exit

       --version
	      output version information and exit

AUTHOR

       Written by Paul Rubin and David MacKenzie.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The full documentation for wc is maintained as a Texinfo manual.  If the info and wc programs are properly installed at your site, the com-
       mand

	      info wc

       should give you access to the complete manual.

wc (coreutils) 4.5.3						   February 2003							     WC(1)