bash for循环是如何使用的 10 Bash for Loop In One Line Examples Bash For Loop Examples In Linux What Is Bash in Linux?...Bash for Loop In one Line with items # for i in 1 2 3 4 5 ; do echo "$i" ; done # for i in {1..5} ; do...$i" ; done # for planet in Mercury...
for file in "$source_dir"/*; do if [ -f "$file" ]; then tar -czf "${file}.tar.gz" "$file" fi done echo "文件已压缩" ``` 7. 统计某个文件中特定字符串出现的次数: ```bash #!/bin/bash file="/path/to/file" search_string="example" count=0 while read -r line; do if ...
line done 使用while循环 while read -r line do echo $line done < filename While循环中read命令从标准输入中读取一行,并将内容保存到变量...line中。...在这里,-r选项保证读入的内容是原始的内容,意味着反斜杠转义的行为不会发生。输入重定向...
$!ba: This constructs a loop that branches back to labelaunless it’s the last line. s/\n//g: This is the substitution command (s), which replaces newline characters (\n) with nothing (an empty string). Thegflag is used to replace all occurrences on each line. ...
# for read each line echo"OS distribution line no.$n:$line" n=$((n+1)) done<$filename Save the file with a name‘OSinfo.sh’and type the following command on the terminal to run the above bash script. $bashOSinfo.sh Now, run the cat command to view the original file content....
How toadd a prefix string at the beginning of each line inBashshellscriptonLinux? For example, assume we have a file a.txt: line1line2 I want to have, preline1pre line2 You may usesed, the streameditorfor filtering and transforming text: ...
For more detail on how to useawk, check followinglink. b.cut Remove sections from each line of files example.txt red riding hood went to the park to play show me columns 2 , 7 , and 9 with a space as a separator cut -d " " -f2,7,9 example.txt ...
printf "\\e[?25h\\n\\e[1;48;5;138m %s\\e[0m\\n" "TermuxArch WARNING: Generated script signal ${RV:-unknown} near or at line number ${1:-unknown} by \`${2:-command}\`!" if [[ "$RV" = 4 ]] then printf "\\n\\e[1;48;5;139m %s\\e[0m\\n" "Ensure bac...
PS1='\e[0;32m\$\e[0m '# PS1 colors not in \[..\]PATH="$PATH:~/bin"# Literal tilde in $PATHrm “file”# Unicode quotesecho"Hello world"# Carriage return / DOS line endingsechohello \# Trailing spaces after \var=42echo$var# Expansion of inlined environment!# bin/bash -x -e...
echo "print each param from \"\$*\"" for var in "$*" do echo "$var" done echo "print each param from \"\$@\"" for var in "$@" do echo "$var" done 执行./test.sh "a" "b" "c" "d",看到下面的结果: $*= a b c d ...