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Top Forums UNIX for Dummies Questions & Answers Search specific string logfile specific date range Post 302936808 by Don Cragun on Saturday 28th of February 2015 01:50:10 AM
Old 02-28-2015
Quote:
Originally Posted by clx
However I checked before responding but its not working for me. Is it version specific?

Code:
$ str="Hello"
$ str+=" "
bash: str+= : command not found
$ str+="World"
bash: str+=World: command not found
$

Yes, it is shell specific and version specific.

You still haven't told us what shell you're using... although it is some version of bash from the diagnostics.

It is in ksh version 93u+ 2012-08-01, but it is not available in any ksh88 and it is not mentioned in the 1995 edition of the book The New Korn shell Command and Programming Language (so it is not available in some earlier versions of ksh93).

I don't know when it was added to bash either.

Note that with any shell based on Bourne shell syntax, you could replace the above with:
Code:
$ str="Hello"
$ str="$str "
$ str="${str}World"
$ echo "$str"
Hello World
$ 


Last edited by Don Cragun; 02-28-2015 at 02:57 AM.. Reason: Note that unknown bash version is used; add portable way to get desired results.
This User Gave Thanks to Don Cragun For This Post:
 

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curs_instr(3X)															    curs_instr(3X)

NAME
instr, innstr, winstr, winnstr, mvinstr, mvinnstr, mvwinstr, mvwinnstr - get a string of characters from a curses window SYNOPSIS
#include <curses.h> int instr(char *str); int innstr(char *str, int n); int winstr(WINDOW *win, char *str); int winnstr(WINDOW *win, char *str, int n); int mvinstr(int y, int x, char *str); int mvinnstr(int y, int x, char *str, int n); int mvwinstr(WINDOW *win, int y, int x, char *str); int mvwinnstr(WINDOW *win, int y, int x, char *str, int n); DESCRIPTION
These routines return a string of characters in str, extracted starting at the current cursor position in the named window. Attributes are stripped from the characters. The four functions with n as the last argument return a leading substring at most n characters long (exclu- sive of the trailing NUL). RETURN VALUE
All of the functions return ERR upon failure, or the number of characters actually read into the string. X/Open defines no error conditions. In this implementation, if the window parameter is null or the str parameter is null, a zero is returned. NOTES
Note that all routines except winnstr may be macros. PORTABILITY
SVr4 does not document whether a length limit includes or excludes the trailing NUL. The ncurses library extends the XSI description by allowing a negative value for n. In this case, the functions return the string ending at the right margin. SEE ALSO
curses(3X). curs_instr(3X)
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