cat

checking to see if an arg is a file and printing accordingly I have the following code that takes in a file via an arg and if none exists, take it from stdin: file= column= pattern= path= cmd="echo" while getopts "f:c:e:" opt; do case $opt in f) file="$OPTARG";; c) column="$OPTARG";; e) pattern="$OPTARG";; *) echo "Usage: …

When redirecting top to a file, why does cat command on that file display output of multiple top attempts? I am customizing a Linux system with a kernel of 6.4.0, and I have noticed a strange issue. When I execute top > a.txt and then open a window to execute cat a.txt, I find that …

Getting a short string from a long one without spaces I have a file with a huge string without spaces in it (something like: "A":123,"B":456,"C":789…) I want to get X amount of chars before and after a specific value (like what is around "B"). But, if I use cat, because the string doesn’t have spaces, …

In bash how to copy an URL within a displayed text file without using the mouse? Let me take you to this short trip: Open terminal. Type cat <any text file in your current working directory, containing a URL, at the beginning> | head The first 10 lines of that text file are printed on …

What is the max size limit for using split and cat combination? I have backed up a file in zip format on Ubuntu whose size is 6.5GB. Trying to transfer it to a USB stick so needed to split since I got error “file size too large” while copying. (Ideally I want my USB to …

How to concatenate files and give another name to output based on the match from another file? I have a directory data in which there are several fastqs like below: SRR13456784_1.fastq SRR13456784_2.fastq SRR13456784_3.fastq SRR13456785_1.fastq SRR13456785_2.fastq SRR13456785_3.fastq SRR13456786_1.fastq SRR13456786_2.fastq SRR13456786_3.fastq SRR19876543_1.fastq SRR19876543_2.fastq SRR19876543_3.fastq SRR19876544_1.fastq SRR19876544_2.fastq SRR19876544_3.fastq I have a details.txt delimited file, in which there two …

Merge files with same name in multiple subfolders I have multiple folders with a lot of files, Each folder has txt files of the same name, I want to merge files with the same name into one txt file. Example: folder/ -sub1 -sub2 -sub3 . . . -sub28 In each subfolder has a multiple files: …

How to use a path to a directory with a space within variable to cat all files within the directory? I have a variable with path to folder1 containing a white space: TEST=path/with space/to/folder1/ I want to concatenate all files within a folder1 with cat but it gives an error: cat "$TEST"* > test cat: …

Concatenating txt files and keeping directory name I am concatenating thousands of .txt files together but I want to keep the path written above the text of each .txt file so I can refer back to the directory to review files if needed. Example: file1.txt has the following content: id: 1234 info: 1234 id: abcd …

Redirecting the content of two files I want to redirect the content of two files to a single file named ooo.txt. I also want to only take some specific lines of the second file using grep (in this case 5 lines before and 25 lines after ‘lol’) WITHOUT using parenthesis Here’s the command that I …

Getting the windows version of a "cat" command? I would like to have this script’s windows version cat name-of-APK.apk | openssl dgst -binary -sha256 | openssl base64 | tr ‘+/’ ‘-_’ | tr -d ‘=’ How can I get that? Asked By: Adam Varhegyi || Source You can actually use cat in PowerShell (which is …

How to create an alias for a "cat" file usable in a path I have two huge files (150G each) and I need to use a tool for which I should supply them as a single file (since the tool only accepts one file). However, I do not want to merge these files for several …

How to replace cat with bat system-wide Ubuntu 22.04 I am using Ubuntu 22.04 with bash, pretty vanilla, and have added alias cat="batcat" to ~/.bashrc. The program batcat or bat being referred to can be found here: https://github.com/sharkdp/bat So, when I run cat ~/.bashrc, for instance, it outputs the contents of the file using batcat. …

Sed delete everything before and after characters I’m running on android this Command: dumpsys activity activities | grep mFocusedApp Output: mFocusedApp=ActivityRecord{273535b u0 com.any.some/.app.AnyActivity t5595} Expected: com.any.some I need the package name only Either by sed or another direct command Edit (Copied from a comment to an answer; added to clarify that the resulting string shall …

"cat ls" messes up my terminal's characters when I go to my /bin directory and do cat ls it messes up my whole terminal’s characters, even my input gets messed up and I have no option but to restart the terminal. I was just watching a toturial and the guy was doing this, his terminal …

Bash: variable is not full read in `for` because line contains blank spaces In for command, variable is not fully saved because of blank spaces. Source file in.csv: VPricingCurrency,Currency,Transactions,VPricingCurrency,Deal,VPricingCurrency CustomerPriceGroup,Customer Price Group,AccountDS,AccountType,AccountDS,AccountType Command: for i in $(cat in.csv); do echo "$i" done Output: VPricingCurrency,Currency,Transactions,VPricingCurrency,Deal,VPricingCurrency CustomerPriceGroup,Customer Price Group,AccountDS,AccountType,AccountDS,AccountType How to get second line full, with blank …

How to concatenate the first 100 files in a directory? I had 4000 text files with unique filenames in a directory. Is there any Linux command to concatenate only the 1-100 files. cat 1.txt … 100.txt > 1.100.txt cat 101.txt … 200.txt > 2.200.txt ……. ……. cat 3901.txt … 4000.txt > 40.4000.txt Suggestions please. Asked …

How to `sudo cat` the contents of a symlink I have created a symlink foo to the file /bar/baz using $ ln -s /bar/baz foo $ ls foo Here /bar/baz is a log file that only root has read permissions for. Now I would like to print the contents of /bar/baz using my symlink. But …

What is the difference between `cat EOF` and `cat EOT` and when should I use it? I’m used to use cat > /path/to/file << EOF when I, in a bash script, printed more than one line into a file… I was checking old code of my company and I found the cat EOT instruction instead …

What are the benefits of this command line (/usr/bin/awk '{$1=$1};1') instead of pure cat I am reading the AWS eic_harvest_hostkeys script and I don’t understand this line: key=$(/usr/bin/awk ‘{$1=$1};1′ < "${file}") What is the of benefit awk? Isn’t key=$(/bin/cat "${file}") better? Asked By: K-att- || Source The assignment to $1 forces awk to rewrite the …