How to cat lt; lt;EOF gt; gt; a file containing code? - Stack Overflow cat with <<EOF>> will create or append the content to the existing file, won't overwrite whereas cat with <<EOF> will create or overwrite the content cat test txt hello cat <<EOF>> test txt > hi > EOF cat test txt hello hi cat <<EOF> test txt > haiiiii > EOF cat test txt haiiiii
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 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
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
Looping through the content of a file in Bash - Stack Overflow $ cat tmp test txt Line 1 Line 2 has leading space Line 3 followed by blank line Line 5 (follows a blank line) and has trailing space Line 6 has no ending CR There are four elements that will alter the meaning of the file output read by many Bash solutions: