在这个程序中，我们被给定一个文件名text.txt。我们的任务是从文件中打印出特定的一行。
为了实现这个目标，bash脚本中有多种方法，它们是awk, sed, head。
$> awk ‘{if(NR==LINE_NUMBER) print $0}’ filename
$> sed -n LINE_NUMBERp filename
$head -n LineNumber filename | tail - n + LINE_NUMBERCode to print a specific line in bash programming from file text.txt.
$> awk ‘{if(NR==5) print $0}’ text.txt$>sed -n 5p text.txt
$head -n 5 filename | tail - n + 5
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