kerby-tool/client-tool/src/main/java/org/apache/kerby/kerberos/tool/kinit/KinitTool.java [271:295]:
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        if (ccacheNameEnv != null) {
            ccacheName = ccacheNameEnv;
        } else if (ccacheNameConf != null) {
            ccacheName = ccacheNameConf;
        } else {
            StringBuilder uid = new StringBuilder();
            try {
                //Get UID through "id -u" command
                String command = "id -u";
                Process child = Runtime.getRuntime().exec(command);
                InputStream in = child.getInputStream();
                int c;
                while ((c = in.read()) != -1) {
                    uid.append((char) c);
                }
                in.close();
            } catch (IOException e) {
                System.err.println("Failed to get UID.");
                System.exit(1);
            }
            ccacheName = "krb5cc_" + uid.toString().trim();
            ccacheName = SysUtil.getTempDir().toString() + "/" + ccacheName;
        }

        return ccacheName;
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kerby-tool/client-tool/src/main/java/org/apache/kerby/kerberos/tool/klist/KlistTool.java [157:181]:
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        if (ccacheNameEnv != null) {
            ccacheName = ccacheNameEnv;
        } else if (ccacheNameConf != null) {
            ccacheName = ccacheNameConf;
        } else {
            StringBuilder uid = new StringBuilder();
            try {
                //Get UID through "id -u" command
                String command = "id -u";
                Process child = Runtime.getRuntime().exec(command);
                InputStream in = child.getInputStream();
                int c;
                while ((c = in.read()) != -1) {
                    uid.append((char) c);
                }
                in.close();
            } catch (IOException e) {
                System.err.println("Failed to get UID.");
                System.exit(1);
            }
            ccacheName = "krb5cc_" + uid.toString().trim();
            ccacheName = SysUtil.getTempDir().toString() + "/" + ccacheName;
        }

        return ccacheName;
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