Unix Shell parsing 1

----Shell 1

testdb3:/home/oracle [Pprod] >more/home/oracle/utility/macro/tns_log_back_12c.sh
#! /usr/bin/ksh



#set-X


if [$# = 0]
Then
echo ""
echo "# Usage: $ TNS log file name"
echo ""
Else

# Set up the search paths:
Path= $PATH:.
Case $PATH in
*/usr/local/bin*);;
*:) Path=${path}/usr/local/bin;;
*) Path=${path}:/usr/local/bin;;
Esac
Export PATH

# Set up the Oracle variables:
Export Oracle_sid=pprod
Export ORACLE_BASE=/OPT/ORACLE12C
Export oracle_home=/opt/oracle12c/product/12.1
Export Oraenv_ask=no
. Oraenv

Export path= $ORACLE _home/bin:.: $PATH:/usr/bin:/usr/sbin:/etc
Export Ld_library_path=/usr/lib: $ORACLE _home/lib
Export ps1= ' hostname ': ' ${pwd} [$ORACLE _sid] > '
Export term=vt220
#export ora_nls33= $ORACLE _home/ocommon/nls/admin/data
Export Nls_lang=american_america. Zhs16gbk
#export Nls_lang=american_america. UTF8
#export nls_date_format= ' Mon DD YYYY HH24:MI:SS '
Umask 022



Date= ' Date +%y%m%d%h%m '

Tns_logname=$1
tns_logbak= ' hostname ' _${tns_logname}_ ' date ' +%y%m%d%h%m '
Tns_logpath=${oracle_home}/network/log

CD ${tns_logpath}
CP ${tns_logname} ${tns_logbak}
If [$?-ne 0]
Then
echo "${bold}error:back TNS log Error!${normal}"
echo ""
Exit 0
Fi
> ${tns_logname}
/usr/contrib/bin/gzip ${tns_logbak}
LS-LRT ${oracle_home}/network/log
Fi


--shell 2

testdb3:/home/oracle [Pprod] >more/home/oracle/utility/macro/compress_all.sh
Script_dir=/home/oracle/utility/macro
Prg_name= $SCRIPT _dir/compress_arch.sh
# $SCRIPT _dir/compress_arch_ngen.sh Ngenpr/ngprdblog 100 10
# $PRG _name Ngende/ngdedblog 10
# $PRG _name Ngenro/ngrodblog 10
# $PRG _name Ngenroa/ngroadblog 10
$PRG _name Topspr/topsprdblog 10
$PRG _name Gdpr/gdprdblog 10
# $PRG _name Ngenpr/ngenprdblog 10
$PRG _name Xprprod/xprproddblog 10
$PRG _name Pcc/pccdblog 10
$PRG _name Corpprod/corpproddblog 10
$PRG _name Bpsprod/bpsproddblog 10
$PRG _name Tgpsprod/tgpsproddblog 10
$PRG _name Wrlprod/wrlproddblog 24
$PRG _name Icomprod/icomproddblog 24
$PRG _name Bizprod/bizlinkdblog 10
#add in 20160901
$PRG _name Oasprod/oasprodlog 10

|

More compress_arch.sh

Oracle_sid=$1
Dname=$2
Compress=/usr/contrib/bin/gzip
Script_dir=/home/oracle/utility/macro

sleep= "/usr/bin/sleep"

# 1. Check whether DB is up and running on server
Up_flag= ' ${script_dir}/chkdbup.sh ${oracle_sid} '

If [${up_flag}-eq 0]; Then
Ls-t ${dname}/*.arc | Awk-v sleep= "${sleep}"-V compress=${compress} '
NR > Max {print COMPRESS, $0;system (SLEEP)}
' | Ksh-x


@@@ 解析 Shell2

1. awk [-parametric variable] ' begin{initialization} condition type 1{action 1} condition type 2{action 2} .... end{after processing} '
Where: The statements in begin and end play a role before starting to read the file (In_file) and after reading the file, which can be understood as initialization and wrap-up.
(1) Parameter description:
-F Re: Allows awk to change its field delimiter
-V var= $v assigns the V value to Var, if there are multiple variables to be assigned, then write multiple-V, each variable assignment corresponds to a-V
e.g. to print the line between the NUM line of file A and the Num+num1 line,
Awk-v num= $num-v num1= $num 1 ' nr==num,nr==num+num1{print} ' a
-F Progfile: Allows awk to invoke and execute the Progfile program file, of course Progfile must be a program file that conforms to the awk syntax.

2. The role of pipelines
The output of the following 2 commands can be compared, indicating that the pipeline is processed in a single line of records.
Ls-t/pproddblog/*.dbf*|more
Ls-t/pproddblog/*.dbf*


3.NR usage
NR NR is the total number of rows read
Conditional expression assigns a value to an expression using two symbols-question mark and colon: conditional expression1? Expression2:expressional3, whose logic is equivalent to conditional expressions in C. The corresponding If/else statements are as follows:
{
if (expression1)
Expression2
Else
Expression3
}
/> Cat Testfile
Northwest NW Charles Main 3.0.98 3 34
Western WE Sharon Gray 5.3.97 5 23
Southwest SW Lewis dalsass 2.7.8 2 18
Southern so Suan Chin 5.1.95 4 15
Southeast SE Patricia Hemenway 4.0.7 4 17
Eastern EA TB Savage 4.4.84 5 20
Northeast NE AM Main Jr. 5.1.94 3 13
North NO Margot Weber 4.5.89 5 9
Pal CT Ann Stephens 5.7.94 5 13

/> awk ' NR <= 3 {print ($7 > 4?) "High" $7: "Low" $7)} ' testfile
Low 3
High 5
Low 2

4.
Let's take a look at a brief introduction to the System () function:

#include
int system (const char *command)

The system () function calls/bin/sh to execute the command specified by the parameter,/bin/sh is typically a soft connection, pointing to a specific shell, such as the BASH,-C option, which tells the Shell to read the command from the String command, and during the command execution, SIGCHLD is blocked, like saying: Hi, kernel, this will not send me sigchld signal, and so on I am busy to say; During the command execution, SIGINT and sigquit are ignored, meaning that the process receives both signals without any action.

Unix Shell parsing 1