随笔分类 - shell
摘要：#part of the code, inside a function local pending readarray -d $'\0' pending < \ <(find /var/lib/fwupd/pending -type f -size -100c -print0 2>/dev/nul
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摘要：Patterns and Pttern Matching We’ll continue refining our solution to Task 4-1 later in this chapter. The next type of string operator is used to match
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摘要：CHAPTER 10|bash Administration Installing bash as the Standard Shell # cor@debian:~/shell/mar17$ cat 3.sh IFS=: for d in $PATH;do echo checking $d: cd
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摘要：CHAPTER 9|Debugging Shell Programs This chapter looks at some useful features that you can use to debug shell programs.We’ll look at how you can utili
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摘要：CHAPTER 8 Process Handling Process IDs and Job Numbers UNIX gives all processes numbers, called process IDs, when they are created. Job Control Foregr
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摘要：Command-Line Processing it separates lines into words, according to delimiters in the environment variable IFS; and it assigns the words to shell vari
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摘要：Chapter 7 Input/Output and Command-Line Processing I/O Redirectors The redirector <> is mainly meant for use with device files (in the /dev directory)
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摘要：Arithmetic Conditionals Operator Meaning -lt Less than -gt Greater than -le Less than or equal to -ge Greater than or equal to -eq Equal to -ne Not eq
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摘要：Typed Variables You can set variable attributes with the declare built-in. * Table 6-1 summarizes the available options with declare. Option Meaning -
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摘要：for|case|select|while and until Command-Line Options and Typed Variables Command-Line Options Typical UNIX commands have the form command [-options]ar
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摘要：Flow Control Exit Status Every UNIX command, whether it comes from source code in C, some other language, or a shell script/function, returns an integ
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摘要：Advanced Examples: pushd and popd Task 4-8 The functions pushd and popd implement a stack of directories that enable you to moveto another directory t
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摘要：Command Substitution The command inside the parentheses is run, and anything the command writes to standard output is returned as the value of the exp
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摘要：Extended Pattern Matching Operator Meaning *(patternlist) Matches zero or more occurrences of the given patterns. +(patternlist) Matches one or more o
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摘要：Length Operator(chapter 4, page[117|99]) There is one remaining operator on variables. It is ${#varname}, which returns the length of the value of the
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摘要：Patterns and Pattern Matching wildcard(通配符) Operator Meaning ${variable#pattern} If the pattern matches the beginning of the variable’s value, delete
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摘要：To define a function, you can use either one of two forms: function functname{ shell commands} or: functname ( ) { shell commands} You can also delete
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摘要：# Table 3-4. Editing mode variables Variable Meaning HISTCMD The history number of the current command. HISTCONTROL A list of patterns, separated by c
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摘要：#Special Characters and Quoting Character Meaning See chapter ~ Home directory 1 ` Command substitution (archaic) 4 # Comment 4 $ Variable expression
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摘要：: "${LOG_FILE:=/var/log/factory_install.log}" Shell Parameter Expansioin ${parameter:=word} If parameter is unset or null, the expansion of word is as
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