如何计算每行中特定字符的数量？

#1 楼

$ sed 's/[^"]//g' dat | awk '{ print length }'
2
0

's/[^(]//g'

$ tr -d -c '"\n' < dat | awk '{ print length; }'

#2 楼

awk -F\" '{print NF-1}' <fileName>

#3 楼

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

#4 楼

awk -F" '{print NF-1}' foo.txt 
awk: program limit exceeded: maximum number of fields size=32767
    FILENAME="foo.txt" FNR=1 NR=1

awk '{ gsub("[^\"]", ""); print length }' foo.txt
Segmentation fault

grep -o \" foo.txt | wc -w

perl -ne '$x+=s/\"//g; END {print "$x\n"}' foo.txt

## sed solution by [maxschlepzig]
$ time sed 's/[^"]//g' foo.txt | awk '{ print length }'
84922
real    0m1.207s
user    0m1.192s
sys     0m0.008s

## using grep
$ time grep -o \" foo.txt | wc -w
84922
real    0m0.109s
user    0m0.100s
sys     0m0.012s

## using perl
$ time perl -ne '$x+=s/\"//g; END {print "$x\n"}' foo.txt
84922
real    0m0.034s
user    0m0.028s
sys     0m0.004s

## the winner: updated tr solution by [maxschlepzig]
$ time tr -d -c '\"\n' < foo.txt |  awk '{ print length }'
84922
real    0m0.016s
user    0m0.012s
sys     0m0.004s

#5 楼

#6 楼

awk '{print gsub(/"/, "")}' <filename>

#7 楼

awk '{ gsub("[^\"]", ""); print length }' input-file

#8 楼

#9 楼

echo $x | tr -d -c '"' | wc -m

#10 楼

 #include <stdio.h>

int main(int argc, char **argv)
{
  if (argc < 2 || !*argv[1]) {
    puts("Argument missing.");
    return 1;
  }
  char c = *argv[1], x = 0;
  size_t count = 0;
  while ((x = getc(stdin)) != EOF)
    if (x == '\n') {
      printf("%zd\n", count);
      count = 0;
    } else if (x == c)
      ++count;
  return 0;
}
 

#11 楼

$ grep -o '"' file.txt|wc -l

#12 楼

awk ' {print (split(q4312078q,a,"\"")-1) }' file_to_parse

#13 楼

x2="${x//[^\"]/}"
echo ${#x2}

expr length "${x//[^\"]/}"

#14 楼

$ wc miseraveis.txt 
29331  304166 1852674 miseraveis.txt 

=========================1 maxschlepzig
$ time sed 's/[^a]//g' mis.txt | awk '{print length}' > a2
real    0m0.704s ; user 0m0.716s
=========================2 maxschlepzig
$ time tr -d -c 'a\n' < mis.txt | awk '{ print length; }' > a12
real    0m0.022s ; user 0m0.028s
=========================3 jjoao
$ time perl -nE 'say y!a!!' mis.txt  > a1
real    0m0.032s ; user 0m0.028s
=========================4 Stéphane Gimenez
$ function countchar(){while read -r i; do echo "$i"|tr -dc ""|wc -c; done }

$ time countchar "a"  < mis.txt > a3
real    0m27.990s ; user    0m3.132s
=========================5 Loki Astari
$ time awk -Fa '{print NF-1}' mis.txt > a4
real    0m0.064s ; user 0m0.060s
Error : several -1
=========================6 enzotib
$ time awk '{ gsub("[^a]", ""); print length }' mis.txt > a5
real    0m0.781s ; user 0m0.780s
=========================7 user606723
#include <stdio.h> #include <string.h> // int main(int argc, char *argv[]) ...  if(line) free(line); }

$ time a.out a < mis.txt > a6
real    0m0.024s ; user 0m0.020s
=========================8 maxschlepzig
#include <stdio.h> // int main(int argc, char **argv){if (argc < 2 || !*argv[1]) { ...  return 0; }

$ time a.out a < mis.txt > a7
real    0m0.028s ; user 0m0.024s
=========================9 Stéphane Chazelas
$ time awk '{print gsub(/a/, "")}'< mis.txt > a8
real    0m0.053s ; user 0m0.048s
=========================10 josephwb count total
$ time grep -o a < mis.txt | wc -w > a9
real    0m0.131s ; user 0m0.148s
=========================11 Kannan Mohan count total
$ time grep -o 'a' mis.txt | wc -l > a15
real    0m0.128s ; user 0m0.124s
=========================12 Kannan Mohan count total
$ time grep -oP 'a' mis.txt | wc -l > a16
real    0m0.047s ; user 0m0.044s
=========================13 josephwb Count total
$ time perl -ne '$x+=s/a//g; END {print "$x\n"}'< mis.txt > a10
real    0m0.051s ; user 0m0.048s
=========================14 heemayl
#!/usr/bin/env python2 // with open('mis.txt') as f: for line in f: print line.count('"')

$ time pyt > a11
real    0m0.052s ; user 0m0.052s
=========================15 enzotib
$ time  while IFS= read -r line; do   line="${line//[!a]/}"; echo "${#line}"; done < mis.txt  > a13
real    0m9.254s ; user 0m8.724s
=========================16 bleurp
$ time awk ' {print (split(q4312078q,a,"a")-1) }' mis.txt > a14
real    0m0.148s ; user 0m0.144s
Error several -1

#15 楼

 #!/usr/bin/env python2
with open('file.txt') as f:
    for line in f:
        print line.count('"')
 

#16 楼

grep -n -o \" file | sort -n | uniq -c | cut -d : -f 1

#17 楼

perl -nE 'say y!a!!'

#18 楼

$ a='"Hello!"'

$ b="${a//[^\"]}"; echo "${#b}"
2