Maximum length of a string

Shell Programming and Scripting
1

good friends days

I would love to know if I can help you know the length of a string

example:


cadena= "cual es mi largo"

echo "cadena : $cadena#

cadena :16
2

Hello tricampeon81,

Could you please try this and let me know if this helps you.

cadena="cual es mi largo"
echo $cadena | awk '{print length($0)}'
OR
echo "cual es mi largo" | awk '{print length($0)}'

Output will be 16 in both above codes.

Thanks,
R. Singh

1 Like
3

How about bash?

cadena="cual es mi largo"
echo "cadena : ${#cadena}"

-Ranga

4

and keep the output in a variable and then make treatment

5 
cadlen=${#cadena}

What do you mean by treatment?

6

I mean a long time I obtained a variable to save after doing validations that value

---------- Post updated at 02:06 PM ---------- Previous update was at 10:34 AM ----------

the truth is that it is for a log file for each nesecito long

example

file.txt

cadena1
cadenados
cadenatercera


ouput 

7
9
13

I have this code does not work me

while read linea
     do
       #echo "Archivos Entrada: $linea"
       largo=`awk '{print length($linea)}'`
       echo "largo : $largo "

       if [ $largo -ne  171  ]; then
         echo "a es igual a 1"
       fi

     done <  ${PATH_DAT}/$ArchPro #while read linea

---------- Post updated at 02:47 PM ---------- Previous update was at 02:06 PM ----------

and solve the problem here is the solution thank you very much to all !!

 while read linea
     do
       #echo "Archivos Entrada: $linea"
       largo=${#linea}
       echo "largo es: $largo "

      if [ $largo -ne 171 ]
       then
         echo "Registro menor a 171"
         echo " $linea > ERROR DE LONGITUD"  >  $PATH_DAT/$ArchSalida
       fi

     done <  ${PATH_DAT}/$ArchPro #while read line
7

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:

$ 
$ 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:

$ 
$ 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
$ 
$
1 Like
8

What is wrong with wc or am I missing something?
Longhand using OSX 10.7.5, default bash terminal...

Last login: Tue Dec 22 20:16:44 on ttys000
AMIGA:barrywalker~> cadena="���� This is a � string... "
AMIGA:barrywalker~> str_length=$(wc -m <<< $cadena)
AMIGA:barrywalker~> echo "String length ="$str_length"..."
String length = 33...
AMIGA:barrywalker~> byte_length=$(wc -c <<< $cadena)
AMIGA:barrywalker~> echo "Byte length ="$byte_length"..."
Byte length = 49...
AMIGA:barrywalker~> _
1 Like