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Using tr ard wc:

function countchar()
{
    while read -r i; do echo "$i" | tr -dc "$1" | wc -c; done
}

Usage:

$ countchar '"' <file.txt  #returns one count per line of file.txt
1
3
0

$ countchar ')'           #will count parenthesis from stdin
$ countchar '0123456789'  #will count numbers from stdin

Using tr ard wc:

function countchar()
{
    while IFS= read -r i; do printf "%s" "$i" | tr -dc "$1" | wc -m; done
}

Usage:

$ countchar '"' <file.txt  #returns one count per line of file.txt
1
3
0

$ countchar ')'           #will count parenthesis from stdin
$ countchar '0123456789'  #will count numbers from stdin

Using tr ard wc:

function countchar()
{
    while read -r i; do echo "$i" | tr -dc "$1" | wc -c; done
}

Usage:

$ countchar '"' <file.txt  #returns one count per line of file.txt
1
3
0

$ countchar ')'           #will count parenthesis from stdin
$ countchar '0123456789'  #will count numbers from stdin

Using tr ard wc:

function countchar()
{
    while read -r i; do echo "$i" | tr -dc "$1" | wc -c; done
}

Usage:

$ countchar '"' <file.txt  #returns one count per line of file.txt
1
3
0

$ countchar ')'           #will count parenthesis from stdin
$ countchar '0123456789'  #will count numbers from stdin

Using tr ard wc:

function countchar()
{
    while read -r i; do echo "$i" | tr -dc "$1" | wc -c; done
}
 
$ countchar '"' <file.txt  #returns one count per line of file.txt
1
3
0

$ countchar ')'           #will count parenthesis from stdin
$ countchar '0123456789'  #will count numbers from stdin

Using tr ard wc:

function countchar()
{
    while read -r i; do echo "$i" | tr -dc "$1" | wc -c; done
}

Usage:

$ countchar '"' <file.txt  #returns one count per line of file.txt
1
3
0

$ countchar ')'           #will count parenthesis from stdin
$ countchar '0123456789'  #will count numbers from stdin