03-13-2008
insert text in the middle of a file
I want to insert a text into the middle of a file
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I have a problem that I want to insert and delete some chars in the middle of a file. fopen() and fdopen() just allow to append at the end.
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Script 1
Pre-requisites
Create a file with x amount of lines in it, the content of your choice.
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I wrote a script like
#!/bin/bash
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now I have problem appending the above script(only using bash shell) so that it now inserts the first argument into the middle of the file.
I have tried using $(('wc -l < file' / 2 ))
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5. Shell Programming and Scripting
how to insert one file into another file not by concatenating as usual done.
file1
A B
C D
E F
G H
I J
K L
file2
23455
33444
33334
33345
Output shud be
23455
A B
C D (4 Replies)
Discussion started by: cdfd123
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6. Shell Programming and Scripting
Can anyone help me pls? I want to add a text into the middle of file.
I've writtenthe following script
text to add="$1"
file="$2"
lines=$(wc -l $2)
half_lines=$(expr $lines / 2)
head -$half_lines $2 > temp
echo "text to add" >> temp
((half_lines=$half_lines + 1))
tail -$half_lines $2... (6 Replies)
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7. UNIX for Dummies Questions & Answers
Hey guys, how do we take a line of text as an argument from a user and then insert it in the middle of a file irrespective of the number of lines in the file. I am trying to do this without SED or AWK. Inserting it in the beginning and at the end is easy, but i am trying to accomplish inserting... (6 Replies)
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8. Shell Programming and Scripting
I have tried
sed '/6/a text_to_inserted' file > newfile
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9. Shell Programming and Scripting
Hi I am trying to write a bash script to add a line of text to the middle of a file.
The way I worked it out was to calculate the number of lines and divide by 2. The file I am using is called newfile and it just contains lines of data.
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10. Shell Programming and Scripting
Hi,
So far i've made a script that takes two argument, 1st is the contents and the 2nd is the named file. At the moment i've managed to insert new contents as a new line at the top, but i want to ask how can you insert contents in the middle of the file?
Source Code
#!/bin/bash
#Write... (3 Replies)
Discussion started by: zen10
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LEARN ABOUT CENTOS
dblink_exec
DBLINK_EXEC(3) PostgreSQL 9.2.7 Documentation DBLINK_EXEC(3)
NAME
dblink_exec - executes a command in a remote database
SYNOPSIS
dblink_exec(text connname, text sql [, bool fail_on_error]) returns text
dblink_exec(text connstr, text sql [, bool fail_on_error]) returns text
dblink_exec(text sql [, bool fail_on_error]) returns text
DESCRIPTION
dblink_exec executes a command (that is, any SQL statement that doesn't return rows) in a remote database.
When two text arguments are given, the first one is first looked up as a persistent connection's name; if found, the command is executed on
that connection. If not found, the first argument is treated as a connection info string as for dblink_connect, and the indicated
connection is made just for the duration of this command.
ARGUMENTS
conname
Name of the connection to use; omit this parameter to use the unnamed connection.
connstr
A connection info string, as previously described for dblink_connect.
sql
The SQL command that you wish to execute in the remote database, for example insert into foo values(0,'a','{"a0","b0","c0"}').
fail_on_error
If true (the default when omitted) then an error thrown on the remote side of the connection causes an error to also be thrown locally.
If false, the remote error is locally reported as a NOTICE, and the function's return value is set to ERROR.
RETURN VALUE
Returns status, either the command's status string or ERROR.
EXAMPLES
SELECT dblink_connect('dbname=dblink_test_standby');
dblink_connect
----------------
OK
(1 row)
SELECT dblink_exec('insert into foo values(21,''z'',''{"a0","b0","c0"}'');');
dblink_exec
-----------------
INSERT 943366 1
(1 row)
SELECT dblink_connect('myconn', 'dbname=regression');
dblink_connect
----------------
OK
(1 row)
SELECT dblink_exec('myconn', 'insert into foo values(21,''z'',''{"a0","b0","c0"}'');');
dblink_exec
------------------
INSERT 6432584 1
(1 row)
SELECT dblink_exec('myconn', 'insert into pg_class values (''foo'')',false);
NOTICE: sql error
DETAIL: ERROR: null value in column "relnamespace" violates not-null constraint
dblink_exec
-------------
ERROR
(1 row)
PostgreSQL 9.2.7 2014-02-17 DBLINK_EXEC(3)