bash.md


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32

# Bash scripting

## String manipulation

Remove shortest from end

    ${VAR%substr}
    # e.g.
    ${FILEPATH%.*}.out   # change extension from whatever to .out

Remove longest from start

    ${VAR##substr}
    # e.g.
    ${FILEPATH##*/}      # get only file name portion

%% - longst from end, # - shortest from start

## Control flow

Loop over files

    for file in glob/*; do something $file; done

Loop over integers

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

## Conditionals

* `-z`: is empty string
* `-f`: is regular file