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shell - Understanding IFS - Unix Linux Stack Exchange The following few threads on this site and StackOverflow were helpful for understanding how IFS works: What is IFS in context of for looping? How to loop over the lines of a file Bash, read line by
Why is `while IFS= read` used so often, instead of `IFS=; while read. . `? The IFS= read -r line sets the environment variable IFS (to an empty value) specifically for the execution of read This is an instance of the general simple command syntax: a (possibly empty) sequence of variable assignments followed by a command name and its arguments (also, you can throw in redirections at any point)
Understanding IFS= read -r line - Unix Linux Stack Exchange Using IFS= LC_ALL=C read -r line works around it there Using var=value cmd syntax makes sure IFS LC_ALL are only set differently for the duration of that cmd command History note The read builtin was introduced by the Bourne shell and was already to read words, not lines There are a few important differences with modern POSIX shells
\n in `IFS=$\n is a variable? - Unix Linux Stack Exchange You can however use: eval "$(printf 'IFS="\n"')" Which works because the output of printf ends in a " character, not a newline Now, for completeness, in the rc shell and derivatives (like es or akanga), $'\n' is indeed the expansion of that \n variable (a variable whose name is the sequence of two characters \ and n)
How to send a command with arguments without spaces? Or more generally, contains a space cat${IFS}file txt The default value of IFS is space, tab, newline All of these characters are whitespace If you need a single space, you can use ${IFS%??} More precisely, the reason this works has to do with how word splitting works Critically, it's applied after substituting the value of variables
understanding the default value of IFS - Unix Linux Stack Exchange Here if the expansion contains any IFS characters, then it split into different 'words' before the command is processed Effectively this means that these characters split the substituted text into different arguments (including the name of the command if the variable is specified first)
How to output comma separated values using IFS=, in shell 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