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for

Shell loop over parameters.

Perform a command with different arguments:

for argument in 1 2 3; do command $argument; done
Perform a command in every directory:

for d in *; do (cd $d; command); done

basic loop

for i in 1 2 3 4 5 6 7 8 9 10 do echo $i done

loop ls command results

for var in ls -alF do echo $var done

loop over all the JPG files in the current directory

for jpg_file in *.jpg do echo $jpg_file done

loop specified number of times

for i in seq 1 10 do echo $i done

same as above, but as one-liner

for i in seq 1 10; do echo $i; done

loop specified number of times: the C/C++ style

for ((i=1;i<=10;++i)) do echo $i done

loop specified number of times: the brace expansion

for i in {1..10} do echo $i done