Visit Our UNIX and Linux User Community

Linux and UNIX Man Pages

Test Your Knowledge in Computers #59
Difficulty: Easy
A compiler is a software utility that translates a program written in high-level language into machine-level language.
True or False?
Linux & Unix Commands - Search Man Pages

ungetc(3s) [hpux man page]

ungetc(3S)																ungetc(3S)

NAME
ungetc() - push character back into input stream SYNOPSIS
Obsolescent Interface DESCRIPTION
inserts the character c (converted to an unsigned char) into the buffer associated with an input stream. That character, c, is returned by the next call to (see getc(3S)) on that stream. A successful intervening call to a file positioning function with stream or erases all memory of the inserted characters. affects only the buffer associated with the input stream. It does not affect the contents of the file corresponding to stream. One character of pushback is guaranteed. If c equals EOF, does nothing to the buffer and returns EOF. Obsolescent Interface pushes character back into input stream. APPLICATION USAGE
After is applied to a stream, the stream becomes byte-oriented (see orientation(5)). RETURN VALUE
If successful, and return c and clear the end-of-file indicator for the stream. and return EOF if they cannot insert the character. WARNINGS
is an obsolescent interface supported only for compatibility with existing DCE applications. New multithreaded applications should use SEE ALSO
flockfile(3S), fseek(3S), fgetpos(3S), getc(3S), setbuf(3S), orientation(5), thread_safety(5). STANDARDS CONFORMANCE
ungetc(3S)

Check Out this Related Man Page

UNGETC(3)						   BSD Library Functions Manual 						 UNGETC(3)

NAME
ungetc -- un-get character from input stream LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <stdio.h> int ungetc(int c, FILE *stream); DESCRIPTION
The ungetc() function pushes the character c (converted to an unsigned char) back onto the input stream pointed to by stream. The pushed- back characters will be returned (in reverse order) by subsequent reads on the stream. A successful intervening call to one of the file positioning functions (fseek(3), fsetpos(3), or rewind(3)), using the same stream, will discard the pushed-back characters. Only one character of push-back is guaranteed, but as long as there is sufficient memory, an effectively infinite amount of push-back is allowed. If a character is successfully pushed-back, the end-of-file indicator for the stream is cleared. The file-position indicator is decremented by each successful call to ungetc(); if its value was 0 before a call, its value is unspecified after the call. RETURN VALUES
The ungetc() function returns the character pushed-back after the conversion, or EOF if the operation fails. If the value of the argument c character equals EOF, the operation will fail and the stream will remain unchanged. SEE ALSO
fseek(3), getc(3), setvbuf(3), ungetwc(3) STANDARDS
The ungetc() function conforms to ISO/IEC 9899:1990 (``ISO C90''). BSD
June 4, 1993 BSD

8 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

How to find EOF character in a Shell ?

Hi, I'm need to determine if a file contains the EOF character, how can I do that in Shell scripting? Regards. (1 Reply)
Discussion started by: jfortes
1 Replies

2. UNIX for Dummies Questions & Answers

\n after EOF

Hello all, I have unix file that ends with the following EOF '9999999999' I want to remove the '\n' character after EOF. What is the command that should be included in the script, before sending the file? will this work: $ echo "<99999999999>\c" >> <filename> thanks in advance. (3 Replies)
Discussion started by: priya12
3 Replies

3. UNIX for Dummies Questions & Answers

How to input EOF from Windows connected to Unix maxhine via SSH

Hi, I'm connected remotely to a unix machine and my machine is running windows and I'm trying to write a C program that's taking input from stdin. How do I enter the 'EOF' character from my keyboard? (in UNIX it would be ctrl-D). I read somewhere that its ctrl-Z, but when I do that the window... (2 Replies)
Discussion started by: sayeo
2 Replies

4. Programming

Eof

How can I write EOF into a file? I tryed to do as follows: size=sizeof(EOF); end_of_file=EOF; write(fdMutexRichieste, &end_of_file, size); But it does non work correctly, becouse in the next cicle (using lseek(..., SEEK_END) of my code it seems to ignore my EOF and use the LAST... (5 Replies)
Discussion started by: DNAx86
5 Replies

5. UNIX for Dummies Questions & Answers

Urgent..!!

What is the output for this prgm? $vi test<<EOF >:5 >dd >:wq! >EOF $ (2 Replies)
Discussion started by: karthi_g
2 Replies

6. UNIX for Dummies Questions & Answers

Poly character into mono character

Hi, Can anyone teach me by using perl. let say i have an input file that content like below: ->line_01 aaabbbDDDTTTUSSy ->line_02 cccdddEEESSSGTTT ->line_03 xxxxyyyyzzzzzzzzzz want the above input file content to become output file like below (every 2nd line after ->... become mono... (7 Replies)
Discussion started by: eisya10
7 Replies

7. Programming

How to input "EOF" signal?

How to input "EOF" signal? #include<stdio.h> int main(int argc,char *argv) { int c,i; i=0; while((c=getchar()) != EOF ) { if(c=='\n') ++i; } printf("%d\n",i); } How to input an "EOF" signal ? to gain the value of "i";Thanks.:) (9 Replies)
Discussion started by: micky.zhou
9 Replies

8. Shell Programming and Scripting

Creating a file from input stream

Hi, Need some help with creating a file from input steam. Meaning from following command myfunc should be able to store the input stream to a file. echo a b c | myfunc The file thus created should have - a b c Here's what I've tried in myfunc() but didn't help - myfunc() { cat... (3 Replies)
Discussion started by: nexional
3 Replies

Featured Tech Videos