{"id":167,"date":"2020-04-22T21:47:15","date_gmt":"2020-04-22T13:47:15","guid":{"rendered":"https:\/\/www.funnymuddy.com\/?p=167"},"modified":"2020-09-02T17:12:53","modified_gmt":"2020-09-02T09:12:53","slug":"shell-tips","status":"publish","type":"post","link":"https:\/\/www.funnymuddy.com\/?p=167","title":{"rendered":"Shell Tips"},"content":{"rendered":"\n

\u83dc\u5355\u9009\u62e9<\/h3>\n\n\n\n
#!\/bin\/bash\necho \"which one do you want?\"\nselect option in option1 option2 option3 option4;\ndo\n break\ndone\necho \"You have selected $option\"<\/code><\/pre>\n\n\n\n
\u7528\u6237\u8f93\u5165<\/h3>\n\n\n\n
read -p \"input a word :\" word\nif [ ! -n \"$word\" ] ;then\n echo \"you have not input a word!\"\nelse\n echo \"the word you input is $word\"\n read -p \"input another word :\" anotherword\nif [ ! -n \"anotherword\" ] ;then\n echo \"you have not input another word!\"\n else\n echo \"another word you input is $anotherword\"\n fi\nfi<\/code><\/pre>\n\n\n\n
\u8f93\u5165\u53c2\u6570<\/h3>\n\n\n\n
if [ -z \"$1\" ]; then\n  echo \"no param input\"\nelse\n  echo \"$1\"\nfi<\/code><\/pre>\n\n\n\n
\u5224\u65ad\u6587\u4ef6\u548c\u6587\u4ef6\u5939<\/h3>\n\n\n\n
#!\/bin\/bash\nif [ ! -e \"\/home\/vagrant\/abc\" ];then\n echo \"file or dir not exists.\"\nelse\n rm -rf \/home\/vagrant\/abc\necho \"file\/dir removed.\"\nfi\n\nif [ ! -d \"\/home\/vagrant\/test\" ];then\n  mkdir \/home\/vagrant\/test\nelse\n  echo \"dir exists.\"\nfi\n\nif [ ! -f \"\/home\/vagrant\/abc\" ];then\n echo \"file not exists.\"\nelse\n rm -f \/home\/vagrant\/abc\necho \"file removed.\"\nfi<\/code><\/pre>\n\n\n\n
Usage<\/h3>\n\n\n\n
#!\/bin\/bash\nif [ $# != 2 ] ; then\necho \"USAGE: $0 file_path_1 file_path_2\"\necho \" e.g.: $0 \/home\/vagrant\/abc \/home\/vagrant\/efg\"\nexit 1;\nfi<\/code><\/pre>\n\n\n\n
\u811a\u672c\u8def\u5f84<\/h3>\n\n\n\n
SCRIPT_DIR=\"$( cd \"$( dirname \"${BASH_SOURCE[0]}\" )\" && pwd )\"\necho $SCRIPT_DIR<\/code><\/pre>\n\n\n\n
sed<\/h3>\n\n\n\n
\u66ff\u6362: \nsed -i \"s\/string_a\/string_b\/g\" file_path\n<\/code>\u66ff\u6362\u7684\u5982\u679c\u662f\u8def\u5f84\uff08\u542b\u6709\/)\uff0c\u5219\u7528|\u4ee3\u66ff\u3002\u6ce8\u610f\u8981\u7528\u53cc\u5f15\u53f7\nstr=\"\/data\/path\"\nsed -i \"s|string_a|$str|g\" file_path<\/code><\/pre>\n\n\n\n
eval<\/h3>\n\n\n\n
mycmd=’ls -all’
eval $mycmd #execute command<\/p>\n\n\n\n
<\/p>\n
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\u83dc\u5355\u9009\u62e9 #!\/bin\/bash echo “which one do you want?” select o… \u9605\u8bfb\u66f4\u591a »Shell Tips<\/span><\/a><\/p>\n
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