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Top Forums Shell Programming and Scripting Why is my cut command not working ? Post 303014251 by John K on Thursday 8th of March 2018 06:01:41 AM
Old 03-08-2018
Why is my cut command not working ?

OS : RHEL 6.8
Shell : bash


I want to remove all lines like below from the history output as it has password.


Code:
$ history | grep sqlplus
  239  sqlplus jn_usr/dxc825#@10.5.12.106/OCSGPD
  256  sqlplus osb_soa/KD1egM09@10.5.12.196/BSOAPRD
  279  sqlplus jn_usr/dxc825#@10.80.16.219/OCSGPD
  402  sqlplus jn_usr/dxc825#@10.80.16.219/MNXSPD
  868  sqlplus jn_usr/dxc825#@10.80.16.219/OCSGPD
  932  sqlplus osb_usr/vsNfCha92@10.5.12.106/OCSGPD
  934  sqlplus osb_usr/vsNfCha92@10.5.12.106/OCSGPD

To remove all the above lines ,I wanted to fetch the first field (239, 256, ....) from the above history command output and then run history -d in loop like below.

# untested
for h in $(history | grep sqlplus | cut -d' ' -f1); do history -d $h; done

But, the cut doesn't work as expected. I tried the following 2 options

The following returns blank
$ history | grep sqlplus | cut -d' ' -f1


The following returns lot of empty lines and few lines at the bottom as shown below

Code:
$ history | grep sqlplus | cut -d' ' -f2






1004
1021
1022
1023
1024
1026
1027
1028
1029
1030

 

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Session::Store::Informix(3)				User Contributed Perl Documentation			       Session::Store::Informix(3)

NAME
Apache::Session::Store::Informix - Store persistent data in a Informix database SYNOPSIS
use Apache::Session::Store::Informix; my $store = new Apache::Session::Store::Informix; $store->insert($ref); $store->update($ref); $store->materialize($ref); $store->remove($ref); DESCRIPTION
Apache::Session::Store::Informix fulfills the storage interface of Apache::Session. Session data is stored in a Informix database. SCHEMA
To use this module, you will need at least these columns in a table called 'sessions': id char(32) # or however long your session IDs are. a_session lvarchar To create this schema, you can execute this command using the sqlplus program: CREATE TABLE sessions ( id char(32) not null primary key, a_session lvarchar ); If you use some other command, ensure that there is a unique index on the table's id column. CONFIGURATION
The module must know what datasource, username, and password to use when connecting to the database. These values can be set using the options hash (see Apache::Session documentation). The options are DataSource, UserName, and Password. Example: tie %hash, 'Apache::Session::Informix', $id, { DataSource => 'dbi:Informix:database', UserName => 'database_user', Password => 'K00l' }; Instead, you may pass in an already-opened DBI handle to your database. tie %hash, 'Apache::Session::Informix', $id, { Handle => $dbh }; The last option is LongReadLen, which specifies the maximum size of the session object. If not supplied, the default maximum size is 8 KB. AUTHOR
This module was written by Mike Langen <mike.langen@tamedia.ch>, based on the original for Oracle. SEE ALSO
Apache::Session, Apache::Session::Store::DBI perl v5.12.1 2007-09-28 Session::Store::Informix(3)
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