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Full Discussion: Maximum length of a string
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
Old 12-22-2015
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
$ 
$

This User Gave Thanks to durden_tyler For This Post:
 

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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)
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