For process Control in the shell

For loop:

Used in the shell for looping. Similar to for in other programming languages, but somewhat different. The For loop is the most common syntax structure in bash.

Common format Format One

For variable

Do

Statement

Done

Format Two

For variable in list

Do

Statement

Done

Format three

for (variable = initial value; condition judgment; variable change)

Do

Statement

Done

If do and for want to be on the same line, you need this

For ARG in [list];d o

Commands ...

Done

ARG will get the variable in the list sequentially

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1, for ((i=1;i<=10;i++));d o echo $ (expr $i \* 4);d One
2. Commonly used in shell is for I in $ (seq)
3, for i in ' ls '

4, for I in ${arr[@]}  &NBSP;
5, for I in $*; do&NBSP;
6, for File in/proc/sys/net/ipv4/conf/*/accept_redirects; do&NBSP;
7, for I in F1 F2 F3;d o 
8, for I in *.txt&NBSP;
9, for I in $ (ls *.txt) &NBSP; the
for in statement is used in combination with" ' and $ (), with the flaw of "or $ () that would be a row-by-line, which is actually a string array of
10, list=" Rootfs usr data data2 "&NBSP;
for D in $LIST; Do&NBSP;
    Use the for in statement to automatically traverse the string by space, &NBSP;
11, for I in {1..10}
12, for I in Stringchar {1..10}
13, awk ' Begin{for (i=1 ; i<=10; i++) Print i} '

Note: The For loop notation in awk is the same as the C language

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For process Control in the shell