linux bash it, and what Bourne Again Shell linux bash it, and what Bourne Again Shell

linux bash it, and what Bourne Again Shell

bash it, and what Bourne Again Shell

Head to write
#! / Bin / bash

set -x #open script debug

1 * Add execute permissions
chmod + x script name
chmod + x testsh1.sh

* 2 executes the script
of the current path of execution
./ script name
testsh1.sh

Full execution path
/tmp/vskedtest/testsh1.sh

Executed by an interpreter
/ bin / sh script path
/ bin / sh testsh1.sh
/ bin / sh /tmp/vskedtest/testsh1.sh

3 * traverse directory file
shpfilepath = `ls / tmp / vskedtest / *. Shp` # -defined directory traversal

for shpFile in $shpfilepath
do
echo $shpFile
done

4 * Executes the specified script
source script path

5 * for cycle value
for J in $ (SEQ. 1. 3)
do
echo $ J # 2. 3. 1
DONE

Quickly generate sample documents
for J in $ (10 SEQ. 1)
do
echo $ J> $ j.xml
DONE

6 *变量self增1
1 i = `expr $ i + 1`;
2 the let i + = 1;
3 ((i ++));
4 i = $ [$ i + 1];
5 i = $ (($ i + 1))

* 7 receives the incoming parameter
$ 0 is performing path itself
$ 1 the first parameter
$ 2 second parameter

8 * delay
sleep in seconds
sleep 1

9 * to enable or disable script debugging
turned on
set -x
closed
set + x
need to write to #! At / bin / bash line or
/ bin / sh -x xxxx.sh

10 * execute external commands
pgsql_path = / usr / bin
$ pgsql_path / -s shp2pgsql 3857 -W -C

11 * Get the current time
of the original time
echo $ (date)
formatted output
echo $ (date "+% Y- % m-% d% H:% M:% S")

12 * output
to the console
echo "string or variable"
output to a file cover
echo "abc"> / opt / testfile111
output to a file append mode
echo "abc122" >> / opt / testfile111

13 * Defined Functions

myfun1 function () {
echo 'IS myoupt the this "
echo" parameter1 first parameter INPUT ". 1 $
echo" parameter2 second parameter INPUT "$ 2

}
Function calls
myfun1 hello world

14 * variable definition and use

myname="vsked"
echo ${myname}

15* while循环
while condition
do
command
done

Finite loop
int. 1 =
the while ((int $ <=. 5))
do
echo $ int
the let "int ++"
DONE
infinite loop
int. 1 =
the while:
do
echo $ int
the let "int ++"
DONE
Example

interval=6

while :
do
echo "666"
sleep $interval
echo "here is 666"
sleep $interval
echo "good idea"

done

16 * execute system commands (note the anti-quotation marks!)
SourceFolderom = "/ opt / testsh / OM /"

for omFile in `ls $sourceFolderom`
do
echo $omFile
done