WebFeb 26, 2024 · Command-line that prints the first 50 lines (cheaply): perl -pe 'exit if $. > 50' f1 f2 f3 ... Delete first 10 lines: perl -i.old -ne 'print unless 1 .. 10' foo.txt Change all the isolated oldvar occurrences to newvar: perl -i.old -pe 's{\boldvar\b}{newvar}g' *.[chy] Command-line that reverses the whole file by lines: perl -e 'print reverse ... You have written: perl -pi e '$_ = q// if $. == 1' myFile which is a clever way to not print the first line, but it most definitely reads the whole file. Run with with -MO=Deparse to get the code and run it in the debugger to see. do { this; that; } if something is a safer construct. – Schwern.
How to delete first line of file in perl script
WebDec 7, 2006 · renaming multiple files with first line of content Hi , I want to rename multiple files with their first line bar the first character + the extension .qual. For the example below the filename should read 7180000000987.qual. I have trawled through different threads for 2 days and I don't seem to find anything I can adopt for this task :confused: ... WebI'm wondering if there is a simplier regex I could use in my code to remove the beginning and ending char in a line. Maybe combine some regex's? In this instance, it's a comma at the beginning and ending of a line. My output should be the fields seperated into CSV format. clinton indian health services
perl - Remove duplicate lines without sorting or removing empty …
WebApr 3, 2024 · Method 1: Using sed Sed is an stream editor. We can easily remove all blank lines using sed command. Use one of following sed command to remove blank lines from file. For example main.txt is your original file from which you need to remove blank lines. ADVERTISEMENT Below command will remove all blank line and save content in second … WebYou can do it using the Tie::File module which ties a file's lines to an array variable: perl -MTie::File -e ' tie @lines,"Tie::File","your_file_here"; $last_line = pop @lines; splice @lines,1,0,$last_line ' WebOct 26, 2007 · a) You need to remove the new line character off the end of the file name you type in. b) You really ought to check that your open works properly. The call to the die function will prevent you trying to process from a non-existant file handle. There are some other things in you code which also need attention - but do get the file reading in first bobcat brushcat blades