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How to add a content in a file in linux without opening the file using vi or cat command


How to add a content in a file in linux without opening the file using vi or cat command

By : user2951832
Date : November 18 2020, 03:49 PM
To fix the issue you can do It's a simple find and replace activity which you can do with sed command as follows,
code :
sed -i 's/quick/quick brown/g' abc.txt


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Which Windows Shell command will print a file content on the standard output (like cat in Linux)?

Which Windows Shell command will print a file content on the standard output (like cat in Linux)?


By : Ashraful Alom
Date : March 29 2020, 07:55 AM
I hope this helps . The command is: type
However, if you want to Unix-fy your Windows shell there are Win32 ports of most of the command Unix style commands.
Linux - Feed a command input with a file and delete the file while the command is running

Linux - Feed a command input with a file and delete the file while the command is running


By : Mbah Dhaim
Date : March 29 2020, 07:55 AM
I hope this helps you . Not sure what you're actually trying to achieve; but your example command can be "fixed" in a way by using xargs:
code :
echo "dummy_file.txt" > dummy_file.txt
cat dummy_file.txt | xargs rm -i
file content as a command input on linux

file content as a command input on linux


By : user3640525
Date : March 29 2020, 07:55 AM
it helps some times If the command expects something on the command line, you can use a syntax like
code :
ls -ll `cat file_list.txt`
Opening a ZIP file, scanning a CSV file inside it and transferring certain content to another CSV file

Opening a ZIP file, scanning a CSV file inside it and transferring certain content to another CSV file


By : asymmonds
Date : March 29 2020, 07:55 AM
I wish this help you From what I understand you simply want all rows where SYMBOL='HINDUNILVR' to be copied to a new file. Below Sample code read the same file and write back to the same file. You can change the file name as required:
code :
import pandas as pd
import os
df1 = pd.read_csv("Sample.csv")
df2 = df1[df1["SYMBOL"]=="HINDUNILVR"]
with open('Sample.csv','a+') as f:
    df2.to_csv(f,header=False,index=False)
import pandas as pd
import os
df1 = pd.read_csv("Sample.csv")
df2 = df1[df1["SYMBOL"]=="HINDUNILVR"]
df2.to_csv("Sample.csv",header=False,mode='a+',index=False)
 if(int(str(sdate.day))<10):
    df1 = pd.read_csv(zf.open("cm" + "0" + str(sdate.day) + MonthCode(sdate.month) + str(sdate.year) + "bhav.csv"))
else:
    df1 = pd.read_csv(zf.open("cm" + str(sdate.day) + MonthCode(sdate.month) + str(sdate.year) + "bhav.csv"))
df2 = df1[df1["SYMBOL"]=="HINDUNILVR"]
df2.to_csv("C:\stock.csv",mode='a+',header=False,index=False)
    if(int(str(sdate.day))<10):
    df1 = pd.read_csv(zf.open("cm" + "0" + str(sdate.day) + MonthCode(sdate.month) + str(sdate.year) + "bhav.csv"))
else:
    df1 = pd.read_csv(zf.open("cm" + str(sdate.day) + MonthCode(sdate.month) + str(sdate.year) + "bhav.csv"))
df2 = df1[df1["SYMBOL"]=="HINDUNILVR"]
with open('C:\stock.csv','a+') as f:
    df2.to_csv(f,header=False,index=False)
Prevent process from opening new file descriptor on Linux but allow receiving file descriptors via sockets

Prevent process from opening new file descriptor on Linux but allow receiving file descriptors via sockets


By : Tim J
Date : March 29 2020, 07:55 AM
wish help you to fix your issue What you have here is exactly the use case of seccomp.
Using seccomp, you can filter syscalls in different ways. What you want to do in this situation is, right after fork(), to install a seccomp filter that disallows the use of open(2), openat(2), socket(2) (and more). To accomplish this, you can do the following:
code :
#include <stdlib.h>
#include <seccomp.h>

static void secure(void) {
    int err;
    scmp_filter_ctx ctx;

    int blacklist[] = {
        SCMP_SYS(open),
        SCMP_SYS(openat),
        SCMP_SYS(creat),
        SCMP_SYS(socket),
        SCMP_SYS(open_by_handle_at),
        // ... possibly more ...
    };

    // Create a new seccomp context, allowing every syscall by default.
    ctx = seccomp_init(SCMP_ACT_ALLOW);
    if (ctx == NULL)
        exit(-1);

    /* Now add a filter for each syscall that you want to disallow.
       In this case, we'll use SCMP_ACT_KILL to kill the process if it
       attempts to execute the specified syscall. */

    for (unsigned i = 0; i < sizeof(blacklist) / sizeof(blacklist[0]); i++) {
        err = seccomp_rule_add(ctx, SCMP_ACT_KILL, blacklist[i], 0);
        if (err)
            exit(-1);
    }

    // Load the context making it effective.
    err = seccomp_load(ctx);
    if (err)
        exit(-1);
}
child_pid = fork();
if (child_pid == -1)
    exit(-1);

if (child_pid == 0) {
    secure();

    // Child code here...

    exit(0);
} else {
    // Parent code here...
}
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