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--- linux:bashshell [2016/01/15 04:47] – [array] admin
+++ linux:bashshell [2022/10/29 16:15] (current) – external edit 127.0.0.1
@@ Line 163: / Line 163: @@
 ==== Bitwise operators ====
 ==== comparision operators ====
-=== integer comparison ===
+=== Integer comparison ===
 -eq : is equal to<code bash>
 if [ "$a" -eq "$b" ]
@@ Line 315: / Line 315: @@
 </code>
 ==== Find files that contain the text ====
+  * Simple<code bash>
+grep -rnw . -e "Begin Facebook Code"
+</code>
+  * Custom find with regular expression<code bash>
+grep -rnw . -e 'mongo.*'
+</code>
+==== Find files that file name length > 29 ====
+<code bash>
+for i in `ls -1`;do sub_i=(`echo $i|cut -d'-' -f 1`);lensub_i=${#sub_i}; if [ $lensub_i -ge 29 ]; then echo $sub_i;echo $i; fi  done
+</code>
+==== Manipulating String ====
+refer: http://tldp.org/LDP/abs/html/string-manipulation.html
+  * String length: **${#string}**:<code bash>
+str="First String"; echo ${#str}
+</code>output:<code>
+</code>
+  * Replace String:<code>${string//substring/replacement}</code>Example:<code bash>
+str="First String"; echo ${str//First/Second}
+</code>output:<code>
+Second String
+</code>
+==== update array to file ====
+Below is array configs.txt:<code>
+c1 = 0,4,5,8,9,12,13,16,17,19,22,21,45,2,3,6,7,10,11,14,15,20,1,23,44,50,26,27,28,29,30,31,32,33,34,35,38,49,47,18,36,37,24,39,40,41,42,43,46,48,25,51
+c2 = 51,4,5,8,9,12,13,16,17,25,22,21,45,2,3,6,7,10,11,14,15,20,1,23,44,50,26,27,28,29,30,31,32,33,34,35,38,49,47,18,36,37,24,39,40,0,42,43,46,48,19,41
+c3 = 26,27,33,34,8,9,12,13,40,41,0,30,31,2,3,6,7,10,11,14,15,20,21,23,44,50,45,1,28,29,32,19,22,4,5,35,38,49,47,18,36,37,24,39,16,17,42,43,46,48,25,51
+</code>
+update array to files:
 <code bash>
-grep -rnw babyshopvn -e "Begin Facebook Code"
+index=0;for i in `cat configs.txt | awk '{print $3}'`; do let "index = $index + 1";echo $i > c$index.txt; done
 </code>