I have written a small shell script to get some values from a text file and have them in a for loop to use them as a variables which I will be using as an input to a wsadmin command. Below is the s...
From this follows: A portable script cannot dependably inherit IFS via the environment. A script that intends to use only the default splitting behavior (or joining, in the case of "$*"), but which may run under a shell which initializes IFS from the environment, must explicitly set/unset IFS to defend itself against environmental intrusion.
The outer IFS (outside the while construct) prevails in all examples shown in the script below.. What's going on here? Have I got the wrong idea of what IFS does in this situation? I expected the array-split results to be as shown in the "expected" column.
I have a file like one below var 3 2014 string var1 4 2011 string4 var2 6 1999 string2 var3 1 2016 string6 Then i have this while read loop to compare one of the colum...
The example does not set IFS within the script, because bash disallows importing IFS from the environment, according to a comment in variables.c: /* Don't allow IFS to be imported from the environment. */ temp_var = bind_variable ("IFS", " \t\n", 0); setifs (temp_var); Built-in commands and non- script uses get the assignment to IFS, of course, but keep in mind that IFS only applies to word ...
If you mean you want the while IFS= read -ru9 line; do ...; done to loop over the output of grep rather than the contents of servers.txt, then with bash, zsh or recent versions of ksh93¹, you can use redirection from a process substitution instead of a pipeline:
¹ Though note that it splits ::a:b::c::: into a, b and c only like IFS-splitting did in the Bourne shell (but not in modern Bourne-like shells except when space, tab or newline are used as separators).
From my reading of O'Reilly's "Classic Shell Scripting," it looks like you want to reset the input field separator IFS to newline, space and tab at the start of every shell script to guard against potentially malicious or otherwise malformed input.
I have a small script, which does not give comma separated output when IFS is used, but IFS is mandatory as i need it to read many other value. The output of the below script is odi_server1 odi_ser...
