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Displaying all the lines starting with some keyword

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Top Forums Shell Programming and Scripting Displaying all the lines starting with some keyword
# 1  
Old 12-29-2011
Displaying all the lines starting with some keyword
consider the contents of a file has many stuff including few stuff that i need.. so i perfromed the below function

Code:
cat filename | grep "ALTER TABLE"

its output is as shown below
Code:
.
.
.
.
.        SET @sql:=CONCAT('ALTER TABLE RecordMixProfile AUTO_INCREMENT=', @maxId) ;
        SET @sql:=CONCAT('ALTER TABLE AccountPolicy AUTO_INCREMENT=', @maxId) ;
        SET @sql:=CONCAT('ALTER TABLE Enterprise AUTO_INCREMENT=', AUTO_INCREMENT=', @maxId) ;
        SET @sql:=CONCAT('ALTER TABLE UserGroup AUTO_INCREMENT=', @maxId) ;
ALTER TABLE Trunk ALTER mediaServerProfileId SET DEFAULT 2;
ALTER TABLE DeviceUDA ALTER mediaServerProfileId SET DEFAULT 2;
ALTER TABLE Trunk ADD INDEX idx_Trunk(destinationAddress);
ALTER TABLE ButtonResourceAppearance ADD INDEX idx_parentButtonId

but i need only the statements that starts with ALTER TABLE like the last 4 lines... how to filter the output..? i am not good at awk nor sed...
# 2  
Old 12-29-2011
Try

Code:
grep "^ALTER TABLE" filename

This User Gave Thanks to siva shankar For This Post:
vivek d r
# 3  
Old 12-29-2011
thanks a lot it worked :-).. but what does '^' do in the code...?
# 4  
Old 12-29-2011
^ refers to start of input string. It will fetch only those lines that have ALTER TABLE at the beginning of line.
This User Gave Thanks to balajesuri For This Post:
vivek d r
# 5  
Old 12-29-2011
oh okay thanks... wait what if the input contents are like this..
Code:
.
.
        SET @sql:=CONCAT('ALTER TABLE Enterprise AUTO_INCREMENT=', AUTO_INCREMENT=', @maxId) ;
        SET @sql:=CONCAT('ALTER TABLE UserGroup AUTO_INCREMENT=', @maxId) ;
                  ALTER TABLE Trunk ALTER mediaServerProfileId SET DEFAULT 2;
                  ALTER TABLE DeviceUDA ALTER mediaServerProfileId SET DEFAULT 2;

that is few empty space before start of ALTER TABLE... will the command work still?
i checked just now it wont work if there is empty space before ALTER TABLE... how to filter if this situation arises??
# 6  
Old 12-29-2011
Code:
grep "^ *ALTER TABLE" inputfile

# 7  
Old 12-29-2011
its not printing all the lines...
Code:
cat tble
        ALTER TABLE Trunk ALTER mediaServerProfileId SET DEFAULT 2;
        ALTER TABLE DeviceUDA ALTER mediaServerProfileId SET DEFAULT 2;
    ALTER TABLE DeviceTurret ALTER mediaServerProfileId SET DEFAULT 1;
                ALTER TABLE Trunk ADD INDEX idx_Trunk(destinationAddress);
 ALTER TABLE ButtonResourceAppearance ADD INDEX idx_parentButtonId(parentButtonId);
                        ALTER TABLE TrunkAOR ADD INDEX idx_parentTrunkId(parentTrunkId);
      ALTER TABLE Button ADD INDEX idx_parentUserCDIId(parentUserCDIId);
   ALTER TABLE CertificateInfo ADD INDEX idx_fingerprint(fingerprint);
          ALTER TABLE SoftwarePackage ADD CONSTRAINT idx_name_parentZoneId UNIQUE (name,parentZoneId);
ALTER TABLE Component ADD CONSTRAINT idx_name_parentSoftwarePackageId UNIQUE (name,parentSoftwarePackageId);
[root@dunkin-ds-dev-103 vivek]#
[root@dunkin-ds-dev-103 vivek]#
[root@dunkin-ds-dev-103 vivek]# grep "^ *ALTER TABLE" "tble"
    ALTER TABLE DeviceTurret ALTER mediaServerProfileId SET DEFAULT 1;
 ALTER TABLE ButtonResourceAppearance ADD INDEX idx_parentButtonId(parentButtonId);
      ALTER TABLE Button ADD INDEX idx_parentUserCDIId(parentUserCDIId);
   ALTER TABLE CertificateInfo ADD INDEX idx_fingerprint(fingerprint);
          ALTER TABLE SoftwarePackage ADD CONSTRAINT idx_name_parentZoneId UNIQUE (name,parentZoneId);
ALTER TABLE Component ADD CONSTRAINT idx_name_parentSoftwarePackageId UNIQUE (name,parentSoftwarePackageId);
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