Linux Shell Script Raiders notes
Chapter III: File Operations1, the production of any size file [[email protected] dd_test]#
[[email protected] dd_test]# dd If=/dev/zero of=junk.data bs=1k count=10
10+0 Records in
10+0 Records out
10240 bytes (Ten kB) copied, 0.00137023 S, 7.5 mb/s2, file system related test [-f $file _var]: The given variable contains a normal file path or file name, returns True [-D $var]: The given variable is a directory , the return is true. [-e $var]: Returns True if the given variable contains a file that exists. [[-Z $STR 1]]: Returns True if Str1 contains an empty string. [[-N $str 1]]: Returns True if STR1 contains a non-empty string. -GT: Greater than-lt: less than-ge: greater than or equal to.-le: less than or equal to.
3. file permissions [[email protected] program_test]# chmod 777 cnts.sh
4. Batch generate files of any size [[email protected] touch_more]# cat create_morefile.sh
#!/bin/bash
For name in {1..100}.txt
Do
Touch $name
DD If=/dev/zero of= $name bs=1k count=1
Done
5. Generate Symbolic link file [[email protected] touch_more]# ln-s 100.txt 100_symbol.txt
[Email protected] touch_more]# Ll-al 100*
lrwxrwxrwx. 1 root root 7 Jan 2 00:24 100_symbol.txt-100.txt
-rw-r--r--. 1 root root 2 00:22 100.txt
Find file methods for symbolic Links One: [[email protected] touch_more]# Ls-al | grep ' ^l ' | awk ' {print $9} '//feature tag, starting with L.
100_symbol.txt method Two: [[email protected] touch_more]# find./-type L
./100_symbol.txt
Print symbolic link to file name: [[email protected] touch_more]# Ls-al 100_symbol.txt |
awk ' {print $11} '
100.txt
6, Traversal files, classification type statistics file
[email protected] touch_more]# cat Filestat.sh#!/bin/bashif [$#-ne 1];then echo $ basepath; Exit 1fipath=$1declare-a Statarray;while Read Line;do ftype=$ (file-b "$line") Let statarray["$ftype"]++;d One < < (find $path-type f-print) //With child process statistics file name echo ===================file types and counts ===============for Ftyp E in "${!statarray[@]}"; Array table do echo $ftype: ${statarray["$ftype"]}done
6. Watch the growing files in real time [[email protected] touch_more]# tail-f filestat.sh
7. Directory switch [[email protected] program_test]# CD-
/home/yxx/program_test/touch_more
Ming Yi World
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Linux Shell Script Raiders notes Chapter III: File Operations
