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// C Language to Replace a specified Line in a Text File
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#include <stdio.h>
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int main(void)
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{
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FILE *fileptr1, *fileptr2;
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char filechar[40];
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char c;
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int delete_line, temp = 1;
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printf("Enter file name: ");
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scanf("%s", filechar);
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fileptr1 = fopen(filechar, "r");
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//print the contents of file .
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while ((c = getc(fileptr1)) != EOF)
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{
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printf("%c", c);
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}
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printf("
Enter line number to be deleted and replaced: ");
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scanf("%d", &delete_line);
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//take fileptr1 to start point.
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rewind(fileptr1);
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//open tempinterm.txt in write mode
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fileptr2 = fopen("tempinterm.txt", "w");
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while ((c = getc(fileptr1)) != EOF)
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{
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//till the line to be deleted comes,copy the content to other
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if (temp != delete_line) {
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putc(c, fileptr2);
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while ((c = getc(fileptr1)) != 'n') putc(c, fileptr2);
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putc('n', fileptr2);
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temp++;
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} else {
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while ((c = getc(fileptr1)) != 'n');
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//read and skip the line ask for new text
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printf("Enter new text: ");
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//flush the input stream
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fflush(stdin);
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getchar(); //delete blank line
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while ((c = getchar()) != 'n') putc(c, fileptr2);
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//take the data from user and place it in new file
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putc('n', fileptr2);
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temp++;
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}
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}
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fclose(fileptr1);
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fclose(fileptr2);
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remove(filechar);
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rename("tempinterm.txt", filechar);
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fileptr1 = fopen(filechar, "r");
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//reads the character from file
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//until last character of file is encountered
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while ((c = getc(fileptr1)) != EOF)
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{
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printf("%c", c);
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}
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fclose(fileptr1);
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return 0;
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[root@localhost 桌面]# ./tmp
Enter file name: hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
Enter line number to be deleted and replaced: 1
Enter new text: asdf
asdf
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
[root@localhost 桌面]#
<script>window._bd_share_config={"common":{"bdSnsKey":{},"bdText":"","bdMini":"2","bdMiniList":false,"bdPic":"","bdStyle":"0","bdSize":"16"},"share":{}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')).src='http://bdimg.share.baidu.com/static/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)];</script>
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