1. Get the specified content from the string
Extract specific information from the string, often used to obtain the file name, file type, path, etc.
1.1 Get string information
用指定的方式(PATTERN)从字符串(PARAMETERS)中移除内容
"\${PARAMETERS#PATTERN}" : 移除从开头匹配的字符串
"\${PARAMETERS##PATTERN}": 移除从开头匹配最长的字符串
"\${PARAMETERS%PATTERN}" : 移除从末尾匹配的字符串
"\${PARAMETERS%%PATTERN}": 移除从末尾匹配最长的字符串
1.2 Search and replace the information in the string
字符串的搜索与替换:
"\${PARAMETERS/PATTERN/STRING}" : 从PARAMETERS中搜索PATTERN,并替换为STRING
"\${PARAMETERS//PATTERN/STRING}": 从PARAMETERS中搜索全部的PATTERN,并替换为STRING
"\${PARAMETERS/PATTERN}" : 从PARAMETERS中搜索PATTERN,并删除
"\${PARAMETERS//PATTERN}" : 从PARAMETERS中搜索PATTERN,并全部删除
1.3 Examples
#########################################################################
# File Name: getFilePathName.sh
# Author: Toney Sun
# mail: [email protected]
# Created Time: 2020年04月17日 星期五 09时57分43秒
# Function: 主要用来从字符串中获取文件名、路径名或者文件类型
#########################################################################
#!/bin/bash
string=/mnt/hgfs/em嵌入式学习记录/shell/linuxShell-5/getFilePathName.sh
cat <<EOF
用指定的方式(PATTERN)从字符串(PARAMETERS)中移除内容
"\${PARAMETERS#PATTERN}" : 移除从开头匹配的字符串
"\${PARAMETERS##PATTERN}": 移除从开头匹配最长的字符串
"\${PARAMETERS%PATTERN}" : 移除从末尾匹配的字符串
"\${PARAMETERS%%PATTERN}": 移除从末尾匹配最长的字符串
EOF
echo $string
echo "\${string#*/}="${string#*/}
echo "\${string##*/}="${string##*/}
echo "\${string%/*}="${string%/*}
echo "\${string%%/*}="${string%%/*}
cat <<EOF
字符串的搜索与替换:
"\${PARAMETERS/PATTERN/STRING}" : 从PARAMETERS中搜索PATTERN,并替换为STRING
"\${PARAMETERS//PATTERN/STRING}": 从PARAMETERS中搜索全部的PATTERN,并替换为STRING
"\${PARAMETERS/PATTERN}" : 从PARAMETERS中搜索PATTERN,并删除
"\${PARAMETERS//PATTERN}" : 从PARAMETERS中搜索PATTERN,并全部删除
EOF
string=/mnt/hgfs/em嵌入式学习记录/shell/linuxShell-5/getFilePathName.sh
echo "\${string/shell/SHELL}="${string/hell/HELL}
echo "\${string//hell/HELL}="${string//hell/HELL}
echo "\${string/hell}="${string/hell}
echo "\${string//hell}="${string//hell}
The results are as follows:
toney@ubantu:/mnt/hgfs/em嵌入式学习记录/shell/linuxShell-5$ ./getFilePathName.sh
用指定的方式(PATTERN)从字符串(PARAMETERS)中移除内容
"${PARAMETERS#PATTERN}" : 移除从开头匹配的字符串
"${PARAMETERS##PATTERN}": 移除从开头匹配最长的字符串
"${PARAMETERS%PATTERN}" : 移除从末尾匹配的字符串
"${PARAMETERS%%PATTERN}": 移除从末尾匹配最长的字符串
/mnt/hgfs/em嵌入式学习记录/shell/linuxShell-5/getFilePathName.sh
${string#*/}=mnt/hgfs/em嵌入式学习记录/shell/linuxShell-5/getFilePathName.sh
${string##*/}=getFilePathName.sh
${string%/*}=/mnt/hgfs/em嵌入式学习记录/shell/linuxShell-5
${string%%/*}=
字符串的搜索与替换:
"${PARAMETERS/PATTERN/STRING}" : 从PARAMETERS中搜索PATTERN,并替换为STRING
"${PARAMETERS//PATTERN/STRING}": 从PARAMETERS中搜索全部的PATTERN,并替换为STRING
"${PARAMETERS/PATTERN}" : 从PARAMETERS中搜索PATTERN,并删除
"${PARAMETERS//PATTERN}" : 从PARAMETERS中搜索PATTERN,并全部删除
${string/shell/SHELL}=/mnt/hgfs/em嵌入式学习记录/sHELL/linuxShell-5/getFilePathName.sh
${string//hell/HELL}=/mnt/hgfs/em嵌入式学习记录/sHELL/linuxSHELL-5/getFilePathName.sh
${string/hell}=/mnt/hgfs/em嵌入式学习记录/s/linuxShell-5/getFilePathName.sh
${string//hell}=/mnt/hgfs/em嵌入式学习记录/s/linuxS-5/getFilePathName.sh
Included in "shell script learning"
