End of File (EOF) in C - Stack Overflow
Why EOF is -1: usually -1 in POSIX system calls is returned on error, so i guess the idea is "EOF is kind of error" any boolean operation (including !=) returns 1 in case it's TRUE, and 0 in case it's FALSE, so getchar() != EOF is 0 when it's FALSE, meaning getchar() returned EOF. in order to emulate EOF when reading from stdin press Ctrl+D
linux - How does "cat << EOF" work in bash? - Stack Overflow
The cat <<EOF syntax is very useful when working with multi-line text in Bash, eg. when assigning multi-line string to a shell variable, file or a pipe. Examples of cat <<EOF syntax usage in Bash: 1. Assign multi-line string to a shell variable $ sql=$(cat <<EOF SELECT foo, bar FROM db WHERE foo='baz' EOF )
linux - What does <<EOF do? - Super User
2015年11月22日 · Instead of using cntrl+d, Cat<<EOF command can be used in this scenario and type EOF at the end of the paragraph. The system will consider EOF as the End of the para. Instead of EOF, any alphabets can be used. eg) CAT<<ZZZ New.txt (Press Enter). Here, the User will be prompted to type the input. At the end of the para, type ZZZ, then press enter.
What is different between "<<-EOF" and "<<EOF" in bash script?
2020年5月1日 · If you use <<-EOF, I recommend the man page of the Bourne Shell: If, however, the hyphen (-) is appended to <<: leading tabs are stripped from word before the shell input is read (but after parameter and command substitution is done on word);
What is EOF in the C programming language? - Stack Overflow
EDIT about EOF: EOF is typically -1, but this is not guaranteed by the standard. The standard only defines about EOF in section 7.19.1: EOF which expands to an integer constant expression, with type int and a negative value, that is returned by several functions to indicate end-of-file, that is, no more input from a stream;
c++ - How does ifstream's eof () work? - Stack Overflow
2010年12月26日 · "The EOF flag is only set after a read operation reaches the end of the file." is exactly the statement that causes confusing about EOF. The EOF flag is only set after a read operation attempts to read past the end of the file. The last bit is critical: If I read 3 bytes from a file 3 bytes long, EOF is false, until I attempt another read. –
linux - What is EOF!! in the bash script? - Stack Overflow
2013年8月30日 · custom_command << EOF!! I want to ask what EOF!! is in the bash script. I did find EOF with google, but google will ignore the "!!" automatically, so I cannot find EOF!!. I know the end of the file token, but I don't exactly know what it means with the "!!" in the script. Is this a mark to force something to do something like in vim's wq! ?
c - I'm trying to understand getchar() != EOF - Stack Overflow
2012年5月23日 · Value of EOF is by default -1. ((c = getchar()) != EOF) As long as the value stays something other than EOF or, in other words, as long as the condition stays true, the loop will continue to iterate. Once the value becomes EOF the value of the entire condition will be 0 and it will break the loop.
How would you represent EOF in bash? - Stack Overflow
2009年1月21日 · the EOT you refer to is only one way to trigger an EOF to the reading program. it's not "the eof character". as said, eof isn't a character. you can change what character triggers an EOF by saying "stty eof A" (or any other character). then, …
character - Representing EOF in C code? - Stack Overflow
2012年9月12日 · The fact that EOF indicates end-of-file does not preclude it from equalling a char value. The fact that EOF is negative does not preclude it from equalling a char value. (Allowing EOF to be a character value is a nuisance but, as the answer I linked to states, does not preclude a C implementation from conforming to the C standard.)
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