linux - How does cat lt; lt; EOF work in bash? - Stack Overflow The cat <<EOF syntax is very useful when working with multi-line text in Bash, eg when assigning multi-line string to a shell variable, file or a pipe Examples of cat <<EOF syntax usage in Bash: 1 Assign multi-line string to a shell variable $ sql=$(cat <<EOF SELECT foo, bar FROM db WHERE foo='baz' EOF )
linux - How can I copy the output of a command directly into my . . . cat file | xclip Paste the text you just copied into a X application: xclip -o To paste somewhere else other than an X application, such as a text area of a web page in a browser window, use: cat file | xclip -selection clipboard Consider creating an alias: alias "c=xclip" alias "v=xclip -o"
How does an SSL certificate chain bundle work? - Stack Overflow Unix: cat cert2 pem cert1 pem root pem > cert2-chain pem Windows: copy A cert1 pem+cert1 pem+root pem cert2-chain pem A 2 2 Run this command openssl verify -CAfile cert2-chain pem cert3 pem 2 3 If this is OK, proceed to the next one (cert4 pem in this case) Thus for the first round through the commands would be
How to append output to the end of a text file - Stack Overflow printf "hello world" >> read txt cat read txt hello world However if you were to replace printf with echo in this example, echo would treat \n as a string, thus ignoring the intent printf "hello\nworld" >> read txt cat read txt hello world
How to get . pem file from . key and . crt files? - Stack Overflow cat otherfilegodaddygivesyou crt gd_bundle-g2-g1 crt > name crt Then I used these instructions from Trouble with Google Apps Custom Domain SSL , which were: openssl rsa -in privateKey key -text > private pem openssl x509 -inform PEM -in www_mydomain_com crt > public pem
Windows batch - concatenate multiple text files into one Windows type command works similarly to UNIX cat Example 1: Merge with file names (This will merge file1 csv file2 csv to create concat csv) type file1 csv file2 csv > concat csv Example 2: Merge files with pattern (This will merge all files with csv extension and create concat csv) When using asterisk(*) to concatenate all files
git - How do I access my SSH public key? - Stack Overflow On terminal cat ~ ssh id_rsa pub explanation cat is a standard Unix utility that reads files and prints output ~ Is your Home User path ssh - your hidden directory contains all your ssh certificates
How to obtain the number of CPUs cores in Linux from the command line? $ cat proc cpuinfo | awk ' ^processor {print $3}' | tail -n 1 NOTE: Since proc cpuinfo holds a number of entries corresponding to the cpus count, a processor field initial value is 0, don't forget to increment the value of the last cpu core by 1