Archive for Linux

Checking the Validity Date of an SSL Certificate~ How to restart network interface~ How can I monitor the memory usage?~ Default max heap size~ How to convert the ^M linebreak to ‘normal’ linebreak in a file opened in vim?~ find difference between two text files with one item per line~ how to extract the first and the last x lines of a big file~ How to remove the ^M return character on Linux~ Find difference between two text files with one item per line~ How to check git changes~ How to list all users in ubuntu/linux~ Bash: Match a word in a string and return the word preceding it~ Delete all files in a folder which don’t match file extensions~ Check space in a disk~ wget – how to mirror only a section of a website~ Move files older than 30 days in current folder to~ How to generate a secure random password~ How to retrieve Perforce password.~ How to get your online secret key directly to your terminal without saving it.~ The request to Suspend this virtual machine failed because the corresponding VMware Tools script did not run successfully.~ BASH Rename all file in a directory~ How can I edit the welcome message when ssh start?~ Find text including subdirectories in ubuntu~ Install the JDK on Ubuntu server~ Copy files with progress bar on terminal~ Decrypt file encrypted with old/primary master key~ How to remove the private master key from your laptop.~ my minimum dot bashrc file~ Add and append text to a file~ Network Connections and network protocol statistics – netstat~ Bash: TAB completion to be case-insensitive~ Get a list of all the cron jobs on a Debian based system~ Why use 64bit?~ Fork bomb~ Sniffing network packages – tcpdump~ Update the timezone~ How to install Java 6 on Ubuntu 12.04~ Search for a specific string inside a directory matching the files’ name~ Re-build the keyboard setting~ Size of a directory~ New IP~ Search for a file in a specific folder matching a string~ Resolve UTF-8 issue in Linux Console~ Untar a file/folder~ Linux basic command: cat, replace, redirect stdout to a file~ SSH Public Key Based Authentication — Howto~
Checking the Validity Date of an SSL Certificate

Checking the Validity Date of an SSL Certificate

echo | openssl s_client -connect maven.escenic.com:443 2>/dev/null | openssl x509 -noout -dates

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How to restart network interface

How to restart network interface

ifdown eth0 ifup eth0

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How can I monitor the memory usage?

How can I monitor the memory usage?

watch -n 5 free -m

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Default max heap size

Default max heap size

If you need to get the default max heap size used by your machine: java -XX:+PrintFlagsFinal -version 2>&1 | grep MaxHeapSize

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How to convert the ^M linebreak to ‘normal’ linebreak in a file opened in vim?

How to convert the ^M linebreak to ‘normal’ linebreak in a file opened in vim?

:%s/<Ctrl-V><Ctrl-M>/\r/g Where means type Ctrl+V then Ctrl+M. Explanation :%s substitute, % = all lines <Ctrl-V><Ctrl-M> ^M characters (the Ctrl-V is a Vim way of writing the Ctrl ^ character) /\r/ with new line (\r) g And do it globally (not just the first occurrence on…

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find difference between two text files with one item per line

find difference between two text files with one item per line

grep -Fxvf file1 file2 Where -F, –fixed-strings Interpret PATTERN as a list of fixed strings, separated by newlines, any of which is to be matched. -x, –line-regexp Select only those matches that exactly match the whole line. -v, –invert-match Invert the sense of matching, to…

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how to extract the first and the last x lines of a big file

how to extract the first and the last x lines of a big file

If you are debugging big txt files, i.e. 6G+, a good start is to check what is at the top and at the end of it. export file=/Users/racoonlab/Downloads/engine.out; head -n 1000 $file >/tmp/extract; echo … skipping … >> /tmp/extract; tail -n 1000 $file >> /tmp/extract

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How to remove the ^M return character on Linux

How to remove the ^M return character on Linux

dos2unix -n oldfile.txt newfile.txt or if the error is within a script: sed -i -e 's/\r$//' your-script.sh Executing a shell script, might end with /bin/bash^M: bad interpreter: No such file or directory The ^M is a carriage return character. Linux uses the line feed character…

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Find difference between two text files with one item per line

Find difference between two text files with one item per line

The command: grep -Fxvf file1 file2 -F, –fixed-strings Interpret PATTERN as a list of fixed strings, separated by newlines, any of which is to be matched. -x, –line-regexp Select only those matches that exactly match the whole line. -v, –invert-match Invert the sense of matching,…

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How to check git changes

How to check git changes

git log -p

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