Bash file name with spaces

http://www.keakon.net/2011/10/20/bash%E4%B8%8B%E5%A4%84%E7%90%86%E5%8C%85%E5%90%AB%E7%A9%BA%E6%A0%BC%E7%9A%84% e6%96%87%e4%bb%b6%e5%90%8d

For example, I create 3 files with a space in the current folder:

keakons-MacBook-Pro:test keakon$ touch "test 1"keakons-MacBook-Pro:test keakon$ touch "test 2"keakons-MacBook-Pro:test keakon$ touch "test 3"keakons-MacBook-Pro:test keakon$ lstest 1test 2test 3

Then the For loop outputs the file name:

keakons-MacBook-Pro:test keakon$ for file in `ls`;> do echo $file;> donetest1test2test3

As you can see, the file names are separated.

Replication does not work either:

keakons-macbook-Pro:test keakon$ mkdir. /bakkeakons-macbook-Pro:test keakon$For fileInch' ls ';Do CP"$file". /bak; DoneCp:bak is a directory (not copied). CP: test:no such file or directory< Span class= "Hljs-symbol" >CP: 1: No such file or directoryCP: test:no such file or directoryCP: 2: No Such file or directoryCP: test:no Such file or directoryCP: 3: No such file or directory       

To solve this problem, of course, start with the word delimiter. In bash, $ifs (Internal Field Separator) is used as a variable with the content "\n\t":

keakons-MacBook-Pro:test keakon$ echo $IFSkeakons-MacBook-Pro:test keakon$ echo "$IFS" | od -t x10000000 20 09 0a 0a 0000004keakons-MacBook-Pro:test keakon$ echo "" | od -t x10000000 0a 0000001

Then change it to "\n\b" and remember to save it before modifying it:

keakons-MacBook-Pro:test keakon$ SAVEIFS=$IFSkeakons-MacBook-Pro:test keakon$ IFS=$(echo -en "\n\b")

It's OK to execute the above command now:

 keakons-macbook-pro:test keakon$ for file in ' ls '; do echo  $file; donetest 1test 2 test 3keakons-macbook-pro:test keakon$ for file in ' ls '; do cp  " $file". /bak; donekeakons-macbook-pro:test keakon$ ls. /baktest 1test 2test 3   

Finally, don't forget to restore the $ifs:

keakons-MacBook-Pro:test keakon$ IFS=$SAVEIFSkeakons-MacBook-Pro:test keakon$ echo "$IFS" | od -t x10000000 20 09 0a 0a 0000004keakons-MacBook-Pro:test keakon$ IFS=$(echo -en " \n\t")keakons-MacBook-Pro:test keakon$ echo "$IFS" | od -t x10000000 20 0a 09 0a 0000004

Bash file name with spaces