尋日寫個script去一行行咁process一個list（你可以當係ls 嘅result），上google search "bash parse line by line"搵極都搵唔到個啱我用嘅example．以我嘅性格，通常明知係得嘅我會堅持，亦即係正所謂嘅死硬派，今次我就選擇錯試（即係try an error）．以我所知，bash會split object based on IFS，即係Input File Separator．於是我就寫左一個script如下：－
OLDIFS=${IFS}
IFS=\n
for line in `ls` ; do
echo "Line read is : ${line}"
done
IFS=${OLDIFS}
但係個output就唔太似樣：－
Line read is :-rw-r--r-- 1 root other 2797 Oct 21 2003 file1.txt -rw-r--r-- 1 root other 32797 Oct 22 2003 file2.txt ．．．
一睇返ls嘅result：－
ls
-rw-r--r-- 1 root other 2797 Oct 21 2003 file1.txt
-rw-r--r-- 1 root other 32797 Oct 22 2003 file2.txt
就知原來佢仲唔識睇\n，以為係"\"同"n"都係一個separator，之後當然試下用single quote, double quote, xx quote....去quote住個\n，但係result當然係一樣啦．．．．真係比佢激死．．．玩足成日都無咩inspiration，於是就決定明日愁來明日當，立刻打道回府，照顧BB去也．今朝返到公司，突然就比我醒起，原來自己N個月前正好寫左個script，又係要line by line咁parse個file．所以都話，有時當你諗唔起點做嘅時候，最好都係唔好開OT，即刻返屋企hea下就反而會有新靈感．亦即係唔係比個死胡同困住，退一步，諗一諗，唔得嘅話就再停一停，先再諗一諗．．．哈哈．．．一睇之下，就發現原來自己太大意，其實只要睇下Advanced Bash Scripting Guide嘅Chapter 5 (Quoting)，就會知道要OS真正了解\n=newline，就要用$加single quote．．．之後只係改左少少如下：－
OLDIFS=${IFS}
IFS=$'\n'
for line in `ls` ; do
echo "Line read is : ${line}"
done
IFS=${OLDIFS}
就成功左．．．．真係有時最基本嘅嘢就最唔記得，比自己玩死．．．
