forestbaker

Novell SuSE
/etc/SuSE-release

Red Hat
/etc/redhat-release, /etc/redhat_version

Fedora
/etc/fedora-release

Slackware

forestbaker

#!/bin/bash

rename -vs

# usage:
# rename oldfilename newfilename *filepattern

# example:
# rename files in present directory ending with .htm to .html

forestbaker

#!/bin/bash

if [ -f /etc/default/grub ]; then
  sed -i '/GRUB_HIDDEN_TIMEOUT=/s/^/#/g' /etc/default/grub
  update-grub
fi

exit 0

forestbaker

### mpstat command ###

# all cpu utilization
mpstat -A

# processor utilization by CPU
mpstat -P 0
mpstat -P 1

# gather multiple reports over time

forestbaker

#!/bin/bash
# These commands test if the system is 64-bit. If not, a warning message in red is displayed, if it is 64-bit, x86_64 is displayed
[ 64 -eq $(arch | cut -c 5-) ] && arch || echo -e "\e[0;41mTHIS IS NOT A 64-BIT OS\e[0m"
[ 64=="$(arch | cut -c 5-)" ] && arch || echo -e "\e[0;41mTHIS IS NOT A 64-BIT OS\e[0m"
  
# Here is a new one, inspired by a post in this thread: 
# http://unix.stackexchange.com/questions/12453/how-to-determine-linux-kernel-architecture
((1<<32)) && arch || echo -e "\e[0;41mTHIS IS NOT A 64-BIT OS\e[0m"

forestbaker

#!/bin/bash
#
  Ctrl + A  Go to the beginning of the line you are currently typing on
  Ctrl + E  Go to the end of the line you are currently typing on
  Ctrl + L  Clears the Screen, similar to the clear command
  Ctrl + U  Clears the line before the cursor position. If you are at the end of the line, clears the entire line.
  Ctrl + H  Same as backspace
  Ctrl + R  Let’s you search through previously used commands
  Ctrl + C  Kill whatever you are running
  Ctrl + D  Exit the current shell

forestbaker

#################
# ENTERTAINMENT #

# free movies on youtube
https://www.openculture.com/freemoviesonline
http://www.openculture.com/freeaudiobooks
https://www.openculture.com/free_textbooks

##############
# ENCRYPTION #

forestbaker

#!/bin/bash

# rough function of http://blog.commandlinekungfu.com/2014/06/episode-179-check-is-in-mail.html

check_CertExpire() {

for d in "$@"; do 
    echo -ne $d\\t; 
    [[ $(( $(date +%s -d "$(echo | openssl s_client -connect www.$d:443 2>/dev/null | 
                            openssl x509 -noout -dates | tail -1 | cut -f2 -d=)") - $(date +%s) ))

forestbaker

# finds all executable files in a sub-directory - casts a wide net
find /mydir/mysubdir -executable -type f

# find all duplicates in sub-directories - slooow
find -not -empty -type f -printf "%s\n" | sort -rn | uniq -d | xargs -I{} -n1 find -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w64 --all-repeated=separate
# find dupes while excluding .svn 
find -type d -name ".svn" -prune -o -not -empty -type f -printf "%s\n" | sort -rn | uniq -d | xargs -I{} -n1 find -type d -name ".svn" -prune -o -type f -size {}c -print0 | xargs -0 md5sum | sort | uniq -w64 --all-repeated=separate
# faster dupe finder (removes 2nd find loop)
find -not -empty -type f -printf "%-30s'\t\"%h/%f\"\n" | sort -rn -t$'\t' | uniq -w30 -D | cut -f 2 -d $'\t' | xargs md5sum | sort | uniq -w32 --all-repeated=separate

forestbaker

# limit Firefox connections/downloads to 8
# change values below in about:config
network.http.max-persistent-connections-per-server
network.http.max-persistent-connections-per-proxy