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Top Forums Shell Programming and Scripting How to extract a paragraph containing a given string? Post 302976443 by drl on Wednesday 29th of June 2016 10:43:47 AM
Old 06-29-2016
Hi.

A grep-like code from ATT, cgrep, allows 3 patterns: the pattern in which you are primarily interested, and the 2 end-point patterns of an enclosing window. Here is an example:
Code:
#!/usr/bin/env bash

# @(#) s1       Demonstrate extraction by matching token in paragraph.
# cgep source:
# http://sourceforge.net/projects/cgrep/ (verified: 2016.06.29)

# Utility functions: print-as-echo, print-line-with-visual-space, debug.
# export PATH="/usr/local/bin:/usr/bin:/bin"
LC_ALL=C ; LANG=C ; export LC_ALL LANG
pe() { for _i;do printf "%s" "$_i";done; printf "\n"; }
pl() { pe;pe "-----" ;pe "$*"; }
db() { ( printf " db, ";for _i;do printf "%s" "$_i";done;printf "\n" ) >&2 ; }
db() { : ; }
C=$HOME/bin/context && [ -f $C ] && $C cgrep

FILE=${1-data1}

pl " Sample input data file $FILE:"
head $FILE

pl " Results:"
cgrep -D -w '^CREATE' +w '^;' table7 $FILE

exit 0

producing:
Code:
$ ./s1

Environment: LC_ALL = C, LANG = C
(Versions displayed with local utility "version")
OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.4 (jessie) 
bash GNU bash 4.3.30
cgrep ATT cgrep 8.15

-----
 Sample input data file data1:
CREATE VIEW view1
AS something
FROM table1 ,table2 as A, table3 (something FROM table4)
FROM table5, table6
USING file1
;
CREATE VIEW view1
FROM table1 ,table2 ,table6 ,table9
something
something

-----
 Results:
CREATE VIEW view1
FROM table1 ,table2 ,table6 ,table7
something
something
FROM table5 ,table7 (something FROM table4 ,table5(this is something FROM table8)
USING file2
;

You will need to compile cgrep. I have done it several times in both 32-bit and 64-bit without trouble.

Best wishes ... cheers, drl
 

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ALTER 
VIEW(7) PostgreSQL 9.2.7 Documentation ALTER VIEW(7) NAME
ALTER_VIEW - change the definition of a view SYNOPSIS
ALTER VIEW [ IF EXISTS ] name ALTER [ COLUMN ] column_name SET DEFAULT expression ALTER VIEW [ IF EXISTS ] name ALTER [ COLUMN ] column_name DROP DEFAULT ALTER VIEW [ IF EXISTS ] name OWNER TO new_owner ALTER VIEW [ IF EXISTS ] name RENAME TO new_name ALTER VIEW [ IF EXISTS ] name SET SCHEMA new_schema ALTER VIEW [ IF EXISTS ] name SET ( view_option_name [= view_option_value] [, ... ] ) ALTER VIEW [ IF EXISTS ] name RESET ( view_option_name [, ... ] ) DESCRIPTION
ALTER VIEW changes various auxiliary properties of a view. (If you want to modify the view's defining query, use CREATE OR REPLACE VIEW.) You must own the view to use ALTER VIEW. To change a view's schema, you must also have CREATE privilege on the new schema. To alter the owner, you must also be a direct or indirect member of the new owning role, and that role must have CREATE privilege on the view's schema. (These restrictions enforce that altering the owner doesn't do anything you couldn't do by dropping and recreating the view. However, a superuser can alter ownership of any view anyway.) PARAMETERS
name The name (optionally schema-qualified) of an existing view. IF EXISTS Do not throw an error if the view does not exist. A notice is issued in this case. SET/DROP DEFAULT These forms set or remove the default value for a column. A default value associated with a view column is inserted into INSERT statements on the view before the view's ON INSERT rule is applied, if the INSERT does not specify a value for the column. new_owner The user name of the new owner of the view. new_name The new name for the view. new_schema The new schema for the view. view_option_name The name of a view option to be set or reset. view_option_value The new value for a view option. NOTES
For historical reasons, ALTER TABLE can be used with views too; but the only variants of ALTER TABLE that are allowed with views are equivalent to the ones shown above. EXAMPLES
To rename the view foo to bar: ALTER VIEW foo RENAME TO bar; COMPATIBILITY
ALTER VIEW is a PostgreSQL extension of the SQL standard. SEE ALSO
CREATE VIEW (CREATE_VIEW(7)), DROP VIEW (DROP_VIEW(7)) PostgreSQL 9.2.7 2014-02-17 ALTER VIEW(7)
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