xargs -s 不懂

1cpuer

# [ /home/soio/1bs/awks ] {2018-02-12 14:13:53} : 1518416033:0;
# echo {1..100} |xargs -s 50 echo
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
64 65 66 67 68 69 70 71 72 73 74 75 76 77 78
79 80 81 82 83 84 85 86 87 88 89 90 91 92 93
94 95 96 97 98 99 100

chengchow

       -s max-chars
              Use at most max-chars characters per command line, including the command and initial-arguments and the terminating nulls at  the
              ends of the argument strings.  The largest allowed value is system-dependent, and is calculated as the argument length limit for
              exec, less the size of your environment, less 2048 bytes of headroom.  If this value is more than 128KiB, 128Kib is used as  the
              default value; otherwise, the default value is the maximum.  1KiB is 1024 bytes.

jason680

回复 1# 1cpuer

1. $ echo {1..100} |xargs -s 50 echo | awk -vFS="" 'BEGIN{for(n=1;n<=50;n+=1){t=t int(n/10);s=s n%10}print t"\n"s}{print "echo "$0, "==>" NF+length("echo ")}'
   
2. 00000000011111111112222222222333333333344444444445
   
3. 12345678901234567890123456789012345678901234567890
   
4. echo 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ==>49
   
5. echo 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 ==>49
   
6. echo 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 ==>49
   
7. echo 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 ==>49
   
8. echo 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 ==>49
   
9. echo 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 ==>49
   
10. echo 94 95 96 97 98 99 100 ==>26
    
11. 
    

复制代码

1cpuer

回复 3# jason680

# [ /home/soio/1bs/awks ] {2018-02-12 16:09:21} : 1518422961:0;
# echo {1..100} |xargs -s 50 echo | awk -vFS="" 'BEGIN{for(n=1;n<=50;n+=1){t=t int(n/11);s=s n%10}print t"\n"s}{print "echo  "$0, "==>" NF+length("echo  ")}'
00000000001111111111122222222222333333333334444444
12345678901234567890123456789012345678901234567890
echo  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ==>50
echo  19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 ==>50
echo  34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 ==>50
echo  49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 ==>50
echo  64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 ==>50
echo  79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 ==>50
echo  94 95 96 97 98 99 100 ==>27

# 这样看的话比较好

{t=t int(n/11);s=s n%10} # 打印的是如下；但还是不打懂 ？[ % ] 是取模计算 ，如何打印了1234567890 ？


00000000001111111111122222222222333333333334444444
12345678901234567890123456789012345678901234567890

NF+length("echo  ") # 这是打印50的 NF 是每一列 "+" 是什么？

### 补贴更真如下

# [ /home/soio/1bs/awks ] {2018-02-14 04:50:27} : 1518555027:0;
# echo {1..100} |xargs -s 50 echo | awk -vFS="" 'BEGIN{for(n=0;n<=50;n+=1){t=t int(n/10);s=s n%10}print t"\n"s}{print "echo  "$0, "==>" NF+length("echo  ")}'
000000000011111111112222222222333333333344444444445
012345678901234567890123456789012345678901234567890
echo  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 ==>50
echo  19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 ==>50
echo  34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 ==>50
echo  49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 ==>50
echo  64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 ==>50
echo  79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 ==>50
echo  94 95 96 97 98 99 100 ==>27