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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
Looping through files with spaces in the names? [duplicate] The shell reads the IFS variable, which is set to <space><tab><newline> by default Then it looks at each character in the output of find As soon as it sees any character that's in IFS, it thinks that marks the end of the file name, so it sets file to whatever characters it saw until now and runs the loop
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
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 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)
bash zsh friendly process substitution - Unix Linux Stack Exchange Which would work in any POSIX-like shell with zsh-style array assignment syntax support (zsh, ksh93, bash, mksh, yash ) assuming an unmodified IFS BTW, -d $'\0' is misleading in bash as bash doesn't support passing NULs inside command arguments
How to temporarily save and restore the IFS variable properly? How do I correctly run a few commands with an altered value of the IFS variable (to change the way field splitting works and how quot;$* quot; is handled), and then restore the original value of I
Loop through tab delineated file in bash script read splits fields separated by characters in the value of the IFS variable, which consists of a space and a tab (plus a newline, which can't occur inside a line) by default