12-18-2018
awk does not print a key equal to 1. It's print when the key is zero. Post increment ++
Value is first equal to 0 and then 1, 2, etc.
0 == fals == no print
1 == true == print
but the sign of inversion ! makes so
!0 == true == print
!1 == false == no print
!2 == false == no print
when you enclose the script in brackets you can not put an inversion sign
In the body it does not work
Last edited by nezabudka; 12-18-2018 at 08:20 AM..
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LEARN ABOUT BSD
syserrlst
SYSERRLST(3) Library Functions Manual SYSERRLST(3)
NAME
syserrlst, __errlst - read system error messages from file
SYNOPSIS
char *
syserrlst(err)
int err;
char *
__errlst(err, path);
int err;
char *path;
DESCRIPTION
Syserrlst(3) reads the error message string corresponding to err from the file /etc/syserrlst.
__errlst(3) reads the error message string corresponding to err from the file path. The file path must be in the format described in
syserrlst(5).
NULL is returned if err is out of bounds (negative or greater than the highest message number in /etc/syserrlst or path) or if the error
message file can not be opened. It is the responsibility of the caller (strerror(3)) to check for and properly handle the NULL return.
RETURN VALUE
NULL if an error was encountered in opening the error message file, if the error was out of bounds, or if the file did not start with the
correct magic number. Otherwise a char * is returned pointing to a static buffer containing the text of the error message.
ERRORS
syserrlst(3) and __errlst(3) can return any of the errors for the open(2), lseek(2), or read(2) system calls.
SEE ALSO
perror(3), strerror(3), syserrlst(5)
HISTORY
syserrlst(3), and __errlst(3) were created for 2.11BSD with the aim of saving 2kb of Data space in programs which called perror(3), or str-
error(3).
BUGS
The information is stored in a static buffer.
3rd Berkeley Distribution March 26, 1996 SYSERRLST(3)