unix - MemoSoup

AIX: reset user password

Change the password for the user (as root):

passwd username

Reset the login counter and unlock the user:

chsec -f /etc/security/lastlog -a "unsuccessful_login_count=0" -s username chuser "account_locked=false" username

Unix: print in color

This simple procedure takes 3 arguments as the parameters:

Text Foreground color Background color

It prints the text to the terminal in selected colors.

function print_color { local text=$1 local fg=$2 local bg=$3 case "$fg" in red) fg="31m" ;; green) fg="32m" ;; yellow) fg="33m" ;; blue) fg="34m" ;; white) fg="37m" ;; black) fg="30m" ;; *) [...]

Unix: rename files to lowercase

It’s very simple to rename the files to lowercase/uppercase using awk:

Lowercase

ls -1rt | awk ‘{ printf("mv %s %s\n", $0, tolower($0)) | "sh" } END { close("sh") }’

Uppercase

ls -1rt | awk ‘{ printf("mv %s %s\n", $0, toupper($0)) | "sh" } END { close("sh") }’

Unix: get the file date

ls -1 | cpio -o | cpio -ivt | awk ‘{print $NF, $(NF-1), $(NF-4), $(NF-3) }’

Warning: I/O expensive for the large files!

Perl:

@a = localtime((stat($my_file))[9]); $a[4]++; printf "%02d%02d%02d",@a[5,4,3];

Redirect script output to the log

If the whole output of the complex script should be redirected to the log, the following trick could be used.

if [ "$1" != "-log" ] ; then $0 -log "$@" 2>&1 | tee the_log_file.$$.log
echo "The log file for the current session: the_log_file.$$.log"
exit 0
fi
shift # remove "-log" parameter

grep in find command: how to display file names

Here is very simple trick to force the grep command to display file name, when it’s used together with find operation. Just write /dev/null as the “second file”

find . -type f -exec grep somestring {} /dev/null \;

Using pattern lists in Unix

Here is the small reminder about the syntax of the “case” command and the usage of the pattern lists.

#!/bin/ksh print -n "Please enter the line: " read line case "$line" in ?(dog|cat) ) print "zero or one occurrence of any pattern" ;; *(low|high) ) print "zero or more occurrences of any pattern" ;; @(duncan|methos) [...]

Print the PATH directories in the readable format

echo $PATH| awk -v RS=":" ‘{ print $0 }’ echo $LD_LIBRARY_PATH |awk -v RS=":" ‘{ system ( "ls -rltd " $0 ) }’

Warning! As far as the option ‘-v’ is used, the new awk(nawk in some systems) should be used.

To check if the new version of awk is installed:

awk 1 /dev/null

The [...]

Parsing script parameters

Quick and dirty parsing procedure for unix shell scripts

parse_command_line () { typeset -i user_opt help_opt password_opt verbose_opt typeset errmsg arg_cou=$# while [ "$#" -gt 0 ] do <strong>case "$1" in</strong> -@([U]) ) let user_opt=user_opt+1 ;; -P ) let password_opt=password_opt+1 ; ask_pass=0 ;; -option1 ) ;; -option2 ) [...]

Rev function and comma-separated output

Here is the shell command snippet to display comma-separated output:

ls -lrt | rev | sed ‘s/\$[0-9][0-9][0-9]\$/\\1,/g’ | rev | sed ‘s/\$[\^0-9]\$,\$[0-9]\$/\\1\\2/g;s/\^,\$[0-9]\$/\\1/g’

Example: -rw-r—– 1 sybase dba 1,572,872,192 Feb 2 07:09 master.dbf

Rev in awk

#!/bin/ksh nawk ‘{ l=length($0) ; for(i=l;i>0;i–) { printf "%s", substr($0,i,1) } ; print "" }’

Rev function (absent on SunOS) [...]

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